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28 Grassy Knoll Challenge: Ghillie in the Mist: I" - Get 50 one-shot kills with sniper rifles.

29 UAV Jammer Challenge: "Cold-Blooded Pro: V" - Destroy 100 Killstreak Rewards while using Cold Blooded.

30 4 the Record Prestige 4 times and reach level 2.

31 Destroyer Challenge: "Search and Destroy Victor: I" - Win 5 Search and Destroy Matches.

32 It's Sabotage! Challenge: "Sabotage Victor: I" - Win 5 Sabotage matches.

33 Shock and Awe Challenge: "Stun Veteran: I" - Kill 20 enemies stunned by stun grenades.

34 Pyromaniac Challenge: "Backdraft: I" - Destroy 2 enemy equipment.

35 Concussive Barrage Challenge: "Think Fast Stun" - Finish an enemy off by hitting them with a stun grenade. (Direct impact).

36 Backfire Challenge: "Return to Sender" - Kill an enemy by shooting their own explosive.

37 Shot Down Challenge: "Crouch Shot: I" - Kill 5 enemies while you are crouching.

38 Hot Shot Challenge: "Defuser: I" - Defuse 2 bombs.

39 The Denier Challenge: "The Denier" - Kill an enemy just before they earn a 10 or higher killstreak reward.

40 Quickdraw Challenge: "Fast Swap" - Hurt an enemy with a primary weapon, then finish them off with a pistol.

41 Hired Gun Challenge: "Counter C4: II" - Kill 20 enemies by shooting c4.

42 Bounty Hunter Steal 50 enemy crates. Must be care packages.

43 Absentee Killer Challenge: "Absentee Killer" - Get a Game Winning Killcam with a Sentry Gun.

44 Blindfire Challenge: "Blindfire" - Kill an enemy while you are still dazed by a flashbang.

45 Gat Trigger Challenge: "MG Master" - Get a 5 kill streak on a mounted gun.

46 Hands Free Challenge "Sentry Veteran: I" - Call in 5 Sentry Guns.

47 Look! No Hands! Challenge: "Look! No Hands!: I" - Get 50 kills with a Sentry Gun.

48 The Automator Challenge: "Look! No Hands!: I" - Get 50 kills with a Sentry Gun.

49 Rain of Fire Challenge: "Air to Ground: I" - Call in 5 Predator Missiles.

50 Reign Down Challenge: "Attack Helicopter Veteran: I" - Call in 5 Attack
Helicopters.

51 Global Thermonuclear War Challenge: "End Game: I" - Call in 2 Nukes.

52 Bombshell Challenge: "Bomb Down" - Kill a bomb carrier in Sabotage or Search and Destroy.

53 Tha Bomb Challenge: "Bomb Defender: I" - Kill 3 enemies while they are defusing a bomb.

54 MOAB (Massive Ordnance Air Blast, although more commonly; Mother of All Bombs) Challenge: "Ultimate Sacrifice" - Use a Tactical Nuke while your team is losing.