And now for the question we've all asked. HOW THE HELL DID I GET THAT TITLE/EMBLEM? Here you go. Note: it's NOT complete yet.
TITLES
1st Lt. - Attaining rank of 1st Lieutenant (Rank 34)
1st Sgt. - Attaining rank of 1st Sergeant (Rank 13)
1bullet2kill - Completing the 2 Kills 1 Bullet challenge (killing two people with one sniper bullet) - confirmed
2Fast - Complete the challenge Slight of Hand Pro I- (Confirmed)
4 the Record
6fears7 - Earn killstreak rewards requiring 7,8, and 9 kills. (Confirmed)
- Misery Loves Company challenge (Blow yourself + an enemy up with a holding grenade; confirmed)
Absentee Killer - Get a Game Winning Killcam with a Sentry Gun (confirmed)
Afterburner - Call in 50 (probably 100) airstrikes (precision and stealth are both airstrike counted)
Airborne - Call in 3 Pavelows getting the 21 ton giant challenge (confirmed)
All Pro - Complete the "All Pro" challenge (2 headshot kills with 1 bullet) (confirmed)
All Your Base - Complete challenge Extreme Cruelty by killing everyone on the enemy team without dying (confirmed)
Accident Prone - Fall 15 feet and survive.(confirmed)
Amplifier
Angel of Death - Call in 10 AC-130s (confirmed)
Armed and Dangerous - Complete challenge Bling Pro VI (900 kills using weapon w/2 attachments)(confirmed)
Art of Stealth - Get Ninja Pro VI(confirmed)
AUG HBAR - Unlock all of the AUG HBAR attachments
Backfire - Kill the person who planted the C4 or Claymore by shooting it
Backsmasher -Complete Backsmasher challenge (Kill an enemy by hitting them in the back with a Riot Shield) (confirmed)
Backstabber - Complete challenge Backstabber (confirmed)
BAM! - Complete challenge Never Forget
Bandolier - Resupply 250 times while using Scavenger (confirmed)
Barrett.50cal? - Unlock all .50 cal attachments (confirmed)
Behind Enemy Lines - Get 10 kills without having any killstreaks selected. Unlocked with 8-bit Price.
Big Bada Boom - Get 5 RPG Multi-Kills (Confirmed)
Big Brother
Bite the Bullet - 1000 kills with stopping power (confirmed)
Blindfire - Complete the Blindfire challenge (kill an enemy while blinded by a flashbang)(confirmed)
Bling Bling - Complete Bling Pro V Challenge (confirmed)
Blood Brothers - Complete Team Player II: 15 wins in Team Deathmatch. (confirmed)
Blood Money - Get payback with a headshot 5 times (confirmed)
Blunt Trauma - Get 2 kills using the riot shield (2 blunt force kills with riot shield)(confirmed)
Boilermaker - Kill 5 enemies by exploding a car
Boom's Away!
Bombshell - Kill the bomb carrier in Sabotage or S&D
Boom Boom
Boom! Headshot - LMG Expert II (confirmed)
Booted -Kill 100 people who are on your team(Confirmed)
Booyah!
Bow Down - Crouch Shot II (confirmed)
Broken Arrow - 50 Airstrikes (Precision or Any Airstrike, not sure which)
Bounty Hunter
Bulletproof - DEFLECT a total of 10000 bullets with a riot shield (confirmed)
Bull?s-eye - Complete Plastered I (5 stick kills with semtex) (confirmed)
C4 And After - Unlock the challenge C4 Shot I (15 C4 Kills)
Carpet Bomber - Kill 5 enemies with single airstrike
Catch Shrapnel - Kill an enemy with a claymore. (confirmed)
Charity Case- Take 3-5 crates from teammates airdrops.
Cheater
Chick Magnet - Call in 2 EMP's (complete challenge), Some other way appears to be possible.
Click Click Boom - Kill an enemy with C4 while you are in Last Stand.(confirmed)
Cloak and Dagger - Complete the Carnie I challenge (5 throwing knife kills) (confirmed)
Close Support - Complete Hardline VI challange (confirmed)
Cluster Bomb
Cobra Strike - Call in 10 Chopper Gunners.
Companion Crate - Complete Air Mail II challenge (call in 25 care packages) (confirmed)
Completely Numb - With painkiller take over 100% of normal damage from an explosion and survive (confirmed).
Concussive Barrage - Damage an enemy and then finish him off with a stun grenade.
Counterintelligence - Complete Scrambler Pro VI challenge
Crackin' Skulls - Complete Assault Rifle: Expert II challenge (unconfirmed)
Da Bomb - Plant the bomb or kill the bomb carrier? (unconfirmed)
DZ Clear - Call in Supplies 5 times (confirmed).
Dead Man's Switch - Injure someone then finish him off with your pistol on Last
Stand (unconfirmed)
Deadline - Complete Hardline Pro V Challenge
Death From Above - Get last kill of match with AC-130 (Must unlock and complete the challenge to obtain title.) (confirmed)
Decathlete - Run 104 miles with Marathon
Destroyer - Plant explosives and destroy the objective.
Devastator - Complete Tango Down Challenge
Dictator - Complete the Dictator challenge (unload an entire LMG magazine into enemies without missing). (confirmed)
Direct Connect
Dishes are Done - Get a payback kill with a claymore (confirmed)
Dish the Rock - Most assists in a game
Disruptor - Obtained by completing Scrambler Pro I challenge.
Double Down - Get 25 kills using the Bling perk (confirmed)
Drifter - Destroy a car
Dronekiller - Last kill in a match with a Predator Drone (Must unlock and complete the challenge to obtain title.) (confirmed)
Dying Breath - 100 last stand kills.
Early Detection - Use UAV in the beginning of a new match(unconfirmed)
End of Line - Call in 5 Tactical Nukes. (Confirmed)
Enemy of the State - Complete Enemy of the State challenge: kill 3 enemies while you are the only surviving member of your team (play hardcore and/or S&D)
Enemy with benefits - Group hug challenge (Sticky an enemy and kill at least two people with the grenade) (confirmed)
EOD
Epic - Kill the whole enemy team within 10 seconds.
Excalibur 100 knife kills
Explosive Ordinance - Related to Search and Destroy(Disarm 2 bombs?)
Eyes Above
FAL - Unlock all FAL attachments
F.N.G. - Unlocked from start
FAMAS - Unlock all FAMAS attachments
Faceoff - 5 headshots with an assault rifle
Fast Track - Run/sprint alot.
Finishing Touch - Get the winning kill in a match with a Precision Airstrike (Must unlock and complete the challenge to obtain title.) (confirmed)
Fired! - Complete the "You're Fired" challenge (50 kills with a Harrier after you Prestige)
Fire and Forget - Call in 25 Sentry Guns
Flatliner - Complete The Brink challenge (confirmed)
Flying Tank - Call in 10 Pave Lows (confirmed)
Flyswatter - Shoot down an enemy helicopter (confirmed)
Frag Out - Complete Grenade Kill I challenge (kill 10 enemies with grenades) (confirmed)
Freerunner - Complete Marathon V challenge (sprint 52 miles with Marathon perk)
Friends with Benefits - Kill an enemy by sticking semtex to an ally (confirmed)
Full Arsenal - First One Man Army challenge
Full Force - Get 10 explosive kills while using danger close. (confirmed)
Full Throttle
Gat Trigger
Gen. - Reach General Rank
Get Real - Win one game of Hardcore Team Deathmatch (confirmed)
Get to the Choppa! - Call in 3 Chopper Gunners
Ghillie in the Mist -Complete Challenge "Ghillie in the Mist II" - 100 1-shot kills with the sniper. (confirmed)
Ghostrider - Complete Air to Ground II (Confirmed)
Givin' Static - Call in 5 Counter-UAVs (confirmed)
Global Thermonuclear War - Call in 2 nukes (confirmed)
Godhand - Complete the challenge AC130 Veteran I by calling in 3 AC130's (confirmed)
Grassy Knoll - Gillie in the Mist I (Get 50 one shot kills with sniper rifle) (Confirmed)
Hair Trigger - Sleight of hand V (confirmed)
Hands Free - X Number of kills with sentry gun.
Hardcore Only - Win 5 rounds in Hardcore Team Deathmatch:Complete Hardcore Team Player II (confirmed)
Hard Target - Complete "Airborne" Challenge (Get a 2 kill streak with bullets while in midair)
Hard To Kill - Get 2 kills while in Final Stand (confirmed)
Headrush
Hello! It's Personal - Kill an enemy with the throwing knife after injuring them first. (confirmed)
High Caliber - Using Stopping Power (confirmed)
High Command
Hijacker - Steal 100 enemy care packages (confirmed)
Highlander - Finish an entire match without dying (Confirmed)
Hired Gun
Hi Def - Get the game winning kill cam with a chopper gunner. (Must unlock and complete challenge to obtain title.) (confirmed)
Hot Shot
How The? - Kill an enemy by using bullet penetration to blow up an explosive through a wall. (Must unlock and complete challenge to obtain title.) (confirmed)
I.C.E. Man
ID Thief - Use Copycat in a match, and kill the player that you copied (confirmed)
I'm Rich - Get 5 Payback kills using C4
Impaler - Complete the challenge Commando Pro I
Intergalactic - Win a Sabotage match (x times?)
Invisible - Complete Silencer challenges (x times?) Complete Cold Blooded Pro I Challenge
Iron Lungs - Getting 200 hip fire kills while using Steady Aim Pro (confirmed)
It's Personal - Complete the 'It's Personal' challenge (kill someone with a throwing knife after wounding them) (confirmed)
It's Sabotage - Win 5 Sabotage Matches
Jack-in-the-Box - Kill an enemy within 5 seconds of spawning via Tactical Insertion 10 times (confirmed)
Joint Ops - Kill an enemy hidden by smoke from a smoke grenade
Juggernaut -Complete "Solid Steel: III" challenge by surviving 50 explosions with blast shield.
Jump Jet - Get 5 Harrier airstrikes. (confirmed)
K Factor - 1001 bullet penetration kills. (confirmed)
Kill For Good
Kleptomaniac - Steal an enemy's care package.
Lights Out - Complete the Think Fast Flash challenge. (kill an enemy with a flash grenade, direct impact)
Live Long... - for 5 consecutive minutes. You must complete the challenge "Survivalist" for this to unlock. (Confirmed)
Living Dead - Survive in Final Stand long enough to get back up. (confirmed)
Lone Wolf - Win (finish in the top 3) free-for-all 3 times, this requires the challenge unlocked (confirmed)
Look! No Hands!
Low Profile - Prone shot II (confirmed)
M16A4 - Get all M16A4 weapon attachments. (Confirmed)
M4A1 - Get all M4A1 weapon attachments. (Confirmed)
Mad Man - Get 5 revenge kills with frag grenades (Bang for Your Buck: I challenge)
Maj. - Reach Major Class
Mastodon - Complete the challenge requiring you to get a 5:1 kill to death ratio. (Confirmed)
Martyr - Kill one enemy with martyrdom death streak perk (confirmed)
Mastermind - Get 15 Claymore Kills
MMMMM... Brains - Complete Both Barrels Challenge. (Kill an enemy with the Ranger by firing both barrels at the same time) (Confirmed)
MOAB - Use a Tactical Nuke (could possibly be right before your team is about to lose, awarded with the rotating green star emblem)
Money Shot - Get a payback in the game winning killcam. (Confirmed)
MVP Assassin
My Li'l Pwny - You get it by getting 10 silenced kills. It can only be obtained once you prestige though. As you have to complete the prestige challenge.
NBK - Get 3 Longshot Kills in one life (confirmed)
Nerves of steel - Either Complete the Color of Money Challenge or Steady Aim
Pro VI
New Jack -Get payback with a throwing knife. (Confirmed)
Ninja - Kill 50 people with your knife or riot shield using the Commando perk (Commando Pro V) (confirmed)
No. - Kill someone cooking off a grenade before they throw it (confirmed)
Noob Tuber - Complete Ouch! Challenge (have to have unlocked the challenge), kill an enemy with a rifle grenade direct impact (confirmed)
Not in the face! - Be killed with a direct impact grenade from a launcher to the head (confirmed)
OG - Get last kill of match with Attack Helicopter (Must unlock and complete the challenge to obtain title.) (Confirmed)
OMFG - Complete Cruelty challenge - Kill enemy, take his gun and kill him with it.
Omnicide - Complete Omnicide! (Intimidation) challenge - Kill entire team (4+) within 10 seconds
Omnipotent - Call in 50 UAVs (confirmed)
One Inch Punch - Complete the Sleight of Hand VI Challenge
Overwatch - Call in 5 UAVs (confirmed)
Owned. - Get last kill of match using a Riot Shield. (Confirmed)
P90 - Unlock all attachments for the P90
Perfectionist - Fire an entire Sniper magazine into your enemies without missing
(Confirmed)
Philanthropist - Allow 50 teammates to take your airdrops.
Phoenix Rising
Pineapple Express -Get 25 kills with frag grenades (confirmed)
Plane Whisperer -Complete Airstrike Inbound I (50 Precision, Stealth, or Harrier strikes) (confirmed)
Plastique - Complete the first C4 Challenge.
Pop Off - Complete SMG Head Shot II
Preemptive Strike - Hardline Pro I (confirmed)
Protect and Serve - Complete Sponge I with riot shield (confirmed)
Pro Gambler
Public Enemy - Win MVP Team Deathmatch (confirmed)
Pushin' Daisies - Fall to your death. (Confirmed)
Pyromaniac - Complete Backdraft I (confirmed)
Quick Change Artist - Get 300 Kills with One Man Army
Quick Draw - Complete Fast Swap challenge (confirmed)
Rainmaker - Get a payback kill by sticking the enemy with a Semtex. (Confirmed)
Rain of Fire - Complete Air to Ground I
Ready. Aim. Fire!
Reign Down - Call in 5 attack helicopters
Rejected - Get Backdraft II challenge (confirmed)
Reloaded - First scavenger challenge
Remote Viewer - X-Ray Vision I (confirmed)
Re-Zero - Complete Gillie In The Mist III (confirmed)
Rival - Kill the same enemy 5 times in a single match (confirmed)
Robin Hood - Get 5 revenge kills using last stand.
Rolling Thunder
S.S.D.D. - Reach Private class
S.S.S.G
Sarge
Scar-H - By getting all attachments for this gun (confirmed)
Schooled
Sgt - Reach Sergeant Class
Share Package - Have a teammate secure 3 emergency air drops (confirmed)
Shock and Awe
Shot Down - Complete Crouch Shot I (Confirmed)
Shot Over
Sidekick - 3 kills in a row with your secondary weapon (confirmed)
SIGINT - Call in 25 Counter-UAVs (confirmed)
Silent Shot
Silent Strike - Complete challenges for the 'Ninja' perk.
Silent Veteran - Get 50 silenced weapon kills after you prestige
Skeet Shooter - Hard Landing Challenge (kill someone while they are in mid-air)
Sky Commander
Smash Hit - 3 Kill Streak with a Riot Shield Melee. (Confirmed)
So Baked - Kill 5 enemies with cooked grenades. (Confirmed)
Solid Steel - Survive 10 grenades with the Blast Shield (complete Solid Steel I)
Sonic Boom
Spectre
Speed Demon - Complete Lightweight Pro I Challenge
Spy Game - Get the Ninja Pro V challenge (confirmed)
Squawk Box - 50 attack helicopters called (confirmed)
Starfish Prime - Call in 5 EMPs (confirmed)
STD
Stickman - Complete the 'Stickman' Challenge. (Stick a Semtex to the enemy in a Game Winning Killcam.)
Straight Up - Call a Harrier Strike 25 times.
Streaker - Get 10 kills in a row without dying. (Must unlock and complete challenge to obtain title.) (Confirmed)
Stuck on You - Complete Plastered II (Stick 25 times with semtex grenades)
Stun Gun - Complete Slow But Sure challenge (confirmed)
Submit to Authority - X-Ray Vision II (confirmed)
Suppressor - 250 number of kills with silencer
Sureshot - Complete Steady Aim Pro I (10 hip fire kills) (confirmed)
Surgical - Go through an entire magazine of assault rifle ammo without missing a shot. (Confirmed)
Ta Da! - Complete the Jack-in-the-Box: II challenge. (Confirmed)
TacDel - Complete Tactical Deletion challenge (Kill 25 enemies that spawn using Tactical Insertion) (confirmed)
Take a Stab - Complete the Carnie II challenge (Get 15 kills with throwing knives) (confirmed)
Tango Down - Kill every member of the opposing team.
Team Player - Win 5 Team Deathmatch Games
Techno Killer - Get a game winning killcam with a stealth bomber
Tha Bomb - Kill bomb planter 10 times
The Automator
The Avenger - Avenge the death of 3 teammates
The Bigger They are... - Kill the number one player on the enemy team 3 times in a row (must unlock and complete challenge) (confirmed)
The Denier - Complete The Denier Challenge (confirmed)
The Feared - Come 1st, 2nd or 3rd in 3 Free-For-All matches. (Confirmed)
The Grim Reaper - Kill 5 members of the enemy team with a single Predator missile
...The Harder They Fall - Kill the number one player on the enemy team 5 times in a row
The Impaler - Set number of melee kills? (Complete Commando challenge - 2 melee kills with Commando perk)
The Invincible
The Legend - Be the last man standing on your team in a search and destroy match. (Confirmed)
The Mad Bomber - Plant two bombs in Search and Destroy or Sabotage.
The Mastodon - Complete the Star Player challenge. Get a 10:1 kill death ratio (confirmed)
The Prestige - Prestige 1 time and reach lvl 5.
The Ripper - Stick a semtex kill to end the match.
The Specialist - Achieve rank 9. (Confirmed)
The Watchman - Call in 100 UAV's or Counter UAV's (confirmed)
Think Fast! - Direct impact kill using Frag grenade (must unlock and complete challenge to obtain) (confirmed).
Thermonuclear War - Get 2 Tactical Nukes (confirmed)
Time is Money - Get 5 payback kills with semtex grenades (confirmed)
Time on Target - 5 Precision Airstrikes (confirmed)
To the Extreme - Win a Team Hardcore match with the top score (MVP Team Hardcore challenge) (confirmed)
Top Gun
Toxic - Get Nuked
Trackstar - Complete the challenge Marathon Pro I
Transformer - Get a Game Winning kill with a Pave Low (Confirmed)
True Liar - Get the last kill of a match with a Harrier (confirmed)
UAV Jammer
Unbelievable - Get a game winning kill with a throwing knife (Must unlock and complete challenge)
Unbreakable - Deflect 10 explosions with the riot shield
Voyeur - Call in 25 UAV's (confirmed)
Vulture - Complete the challenge Scavenger VI
Wargasm - Complete the "Wargasm" challenge (get all 3 of your killstreak rewards in under 20 seconds)
X-Ray Vision - X number of Bullet Penetration Kills
EMBLEMS
2 Skulls
8-Ball
8-bit Price - Achieve a kill streak of 10 while having no kill streak awards equipped. (Confirmed)
Al-Asad - Plant 10 Bombs (confirmed)
Bar of pink soap - Get a "Payback" by sticking a Semtex on an enemy. You have to get both "Stuck!" and "Payback" with the Semtex. (CONFIRMED)
Binoculars - Get 3 LongShot Kills in One Life
Biological Hazard Symbol - Awarded for getting nuked
Black Skull - Complete the "Collateral Damage" challenge (confirmed)
Bling perk emblem - Complete all the bling challenges
Bloody Handprint [Militia symbol] - Awarded alongside "Streaker" (Confirmed)
Bloody skull with a bullet hole - Awarded when winning 30 Team Deathmatch matches (Team Player: III)) (confirmed)
Boot Stomping - Complete "Airborne" Challenge (Get a 2 kill streak with bullets while in midair)
Cartoon girl's head - Awarded alongside "Dishes are Done" title
Cobra helicopter - Possibly related to AT4-HS Challenges.
Comic book-style Juggernaut head - Awarded for absorbing so many shots with riot shield (Confirmed)
Compass
Copycat Head - Copy someone?s class, then get a payback on that same person you copied.
Crossed Knives
Crutches - Awarded with Accident Prone
Daisy Flower - Awarded alongside "Pushin' Daisies" title (confirmed)
Desert camo hat with a knife - Awarded with its Personal!
Dogtags - Default Starting Emblem
Dual pistols
Dunn
Eye of Providence - Awarded alongside "How The?" title
Final Stand Icon - Get back on your feet whilst in final stand or kills in final stand
Gatling Gun - Received with Absentee Killer challenge
Golden Eagle - Complete the "Flawless" challenge. Go entire match without dying (confirmed)
Gorilla with Crown - Complete Enemy of the State challenge
Heartbeat sensor - Awarded with 'Givin' Static' callsign
Hearts
HMMWV (Humvee) - Destroy a car (awarded with Drifter)
HMMWV with Rocket Launcher
Infinity Ward Flask
Infinity Ward logo - Complete "Wargasm" Challenge - Confirmed
Juggernaut head - From Riot Shield Challenge - Two Kill streak with shield (confirmed)
Makarov - Be the MVP in a Search and Destroy match (confirmed)
Man in Crosshairs - Awarded with Perfectionist (confirmed)
Marijuana leaf - Awarded with The Denier challenge.
Martyrdom grenade - Awarded for getting a kill with the Martyrdom Death Streak
Medic Helmet - Awarded when have taken 100% normal damage while in pain killer mode by an explosive and live
Men raising flag (Iwo Jima) - Awarded in Capture the flag.
Ninja Shuirken - Complete backstabber challenge (confirmed)
Painkiller pill - Once painkiller is active, survive enough to kill you normally as you kill another player
Pair of Boots
Parachute - Assigned with Accident Prone (confirmed)
Pave Low - Acquired after calling in 25 Pave Low helicopters
Pig
Pink Skull - Complete Survivalist Challenge by surviving for 5 minutes. (confirmed)
Porter Justice poster
Ranger Helmet - Awarded when completing Assault Expert: III
Rank - Composed of several emblems, awarded for attaining each MP rank
Red Beret (Airborne) - Prone Shot III (confirmed)
Red Devil - Awarded for winning 15 Hardcore Team Deathmatch games.
Riot shield with a skull - Complete the "Riot Shield Veteran III" Challenge (Confirmed)
Sea Sniper Emblem (Gold Globe & Anchor w/swords/sniper rifle)
Sergeant Simon Riley A.K.A Ghost - Win MVP in a Team Deathmatch (confirmed)
Shark face - I got this after I completed the 21 Ton Giant challenge 3.
Shotgun shells - Awarded with MMMM... Brains. Completing Both Barrels challenge
Single Pistol - Complete "Sidekick" challenge (confirmed)
Single Throwing Knife - Winning game kill with a throwing knife.
Snowmobile - Complete the "Slow but Sure" challenge
Soap
SSgt. Griggs
Steaks
Tan Beret (22 SAS) - Crouch Shot III (confirmed)
Task Force 141 - Unlocked at Rank 41 (confirmed)
UFO - Kill someone, pick up their weapon, and kill them again with their own weapon. (Confirmed)
Velociraptor Talon
Rotating AC-130 - Launch 25 AC-130's
Rotating Air drop - Call in 50 Airdrops
Rotating Attack Helicopter - Complete Attack Chopper III
Rotating Counter-UAV - Call in 50 Counter-UAVs
Rotating Emergency Airdrops - Call in 25 Emergency Airdrops
Rotating Harrier - Call in 50 Harriers Complete Vertical Takeoff III Challenge
Rotating Modern Warfare Green Star - Call in a nuke in a game when your team is just about to lose the match: Confirmed)
Rotating Nuclear Symbol - Call in 10 Tactical Nukes
Rotating Pave Low - Call in 25 Pave Lows
Rotating Predator missile - Call in 50 Predator Missiles (Complete Air to Ground III Challenge)
Rotating Sentry Gun - Call in 50 Sentry Guns
Rotating Skull - Awarded When getting to 10th Prestige
Rotating Tesla Ball - Call in 10 EMPs
Rotating UAV - Call in 50 UAVs