Singleplayer: Complete Running with Wolves...

Singleplayer: Achieve 20 total knife kills

Singleplayer: In Breaking Bagram, destroy 2 vehicles with a single 2000 lb Laser Guided Bomb

Singleplayer: In First In, Kill the Hostage Taker with a Head Shot

Launch the cow in New Junk City

Defeat 20 enemies with hand-to-hand combat

Finish the game in Normal Mode

Kill 50 enemies with the M4

Kill 30 enemies with the Dragon Sniper

Kill 20 enemies by shooting from the hip (without aiming with the L1 button)

Kill five enemies with a single punch, after softening them up with gunfire

Kill 50 enemies in a row without dying

Kill 100 enemies with headshots