Kill 2 enemies with a single bullet in Single Player or Special Ops.

Finish the game in Easy Mode

Finish the game in Hard Mode

Defeat 30 enemies with the RPG - 7

Defeat 50 enemies with the Dragon Sniper

Defeat 50 enemies with stealth attacks

Defeat 20 enemies with the Pistole

Defeat 20 enemies with gunfire by aiming while hanging

Defeat 20 enemies with headshots

Defeat 30 enemies with the Moss - 12

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

Defeat 50 enemies with hand-to-hand combat