• That Wasn't So Hard 5
• Complete a scene as Bishop's teammate, Knight, in co-op Story mode at any difficulty.
• Completed Pic des Pyrenees    25
• Complete Pic des Pyrenees in Story Mode at any difficulty.
• Completed Old Vegas    25
• Complete Old Vegas in Story Mode at any difficulty.
• Completed Recreational Center    25
• Complete Recreational Center in Story Mode at any difficulty.
• Completed Convention Center    25
• Complete Convention Center in Story Mode at any difficulty.
• Completed Theater    25
• Complete Theater in Story Mode at any difficulty.
• Completed Nevada Desert    25
• Complete Nevada Desert in Story Mode at any difficulty.
• Completed Estate    25
• Complete Estate in Story Mode at any difficulty.
• Freedom Shall Prevail    75
• Complete the Story Mode on Realistic difficulty.
• I Like the Sound it Makes    25
• Kill 150 terrorists with a Shotgun.
• Weapon Collector    30
• Unlock every weapon in the game.
• Rappel King    20
• Kill 25 enemies while suspended from a rope.
• My Name is Sam    25
• Neutralize 5 terrorists in a row by performing headshots using a Sound Suppressor.
• Gimme a High Five!    10
• Complete 5 scenes as Bishop's teammate, Knight, in co-op Story mode at any difficulty.
• Here's for a Wicked Five!    20
• Complete 10 scenes as Bishop's teammate, Knight, in co-op Story mode at any difficulty.
• Novice Hunter    5
• Complete your first Terrorist Hunt mission at any difficulty.
• Veteran Hunter    20
• Complete 5 Terrorist Hunt missions at any difficulty.
• Natural Leader    15
• Lead your team to Victory 20 times in Team Leader with at least 6 players present.
• Extreme Hunter    50
• Complete all Terrorist Hunt missions on Realistic difficulty.
• Bring it on!    10
• Complete a Terrorist Hunt mission at the hardest difficulty.
• Pointman    10
• Kill 50 enemies in multiplayer adversarial with at least 6 players present.
• Triggerman    20
• Kill 150 enemies in multiplayer adversarial with at least 6 players present.
• Gun Shark    25
• Kill 300 enemies in multiplayer adversarial with at least 6 players present.
• Eye of the Sniper    30
• Kill 500 enemies in multiplayer adversarial with at least 6 players present.
• Don't Mess With Me    45
• Kill 1000 enemies in multiplayer adversarial with at least 6 players present.
• Ace of Spades    15
• Perform 5 consecutive kills without dying in an adversarial match without respawns
• The Ace Always Wins    5
• Win your first ranked match online.
• Double or Nothin'    10
• Win 2 ranked matches in a row.
• Three of a Kind    15
• Win 3 consecutive ranked matches in a row.
• Royal Flush    30
• Win 100 adversarial matches with at least 6 players present.
• The House Always Wins    15
• Host and win 10 matches with at least 6 players present.
• My Hero!    10
• Rescue both Hostages 10 times in Attack & Defend with at least 6 players present.
• Kamikaze    10
• Plant and detonate 10 bombs in Attack & Defend with at least 6 players present.
• Demo Expert    10
• Defuse 10 bombs in Attack & Defend with at least 6 players present.
• Covert Ops Specialist    10
• Extract the intel item 10 times with at least 6 players present
• Cluster Bomb    10
• Kill 3 enemies at once using explosives with at least 6 players present
• Sidearm Frenzy    25
• Kill 100 enemies using a Pistol with at least 6 players present.
• Come Closer    20
• Kill 100 enemies using a shotgun with at least 6 players present
• Spray and Pray    15
• Kill 100 enemies using a Sub-Machine Gun with at least 6 players present.
• Short Controlled Bursts    15
• Kill 100 enemies using an Assault Rifle with at least 6 players present.
• One Shot, One Kill    30
• Kill 100 enemies using a Sniper Rifle with at least 6 players present.
• Machine Gunner    20
• Kill 100 enemies using a Light Machine Gun with at least 6 players present.
• Private First Class    10
• Achieve the rank of Private First Class.
• Officer    30
• Achieve the rank of Officer
• Elite    50
• Achieve the rank of Elite
• Haute Couture    10
• Create your own custom camouflage.
• True Identity    20
• Use the Xbox Live Vision to create a character with your appearance.

Via Xbox 360 Achievement