Defeat 20 enemies with hand-to-hand combat

Finish the game in Easy Mode

Defeat 20 enemies with a single punch, after softening them up with gunfire

Defeat 50 enemies with stealth attacks

I can't even capture it on my camera.

Defeat 70 enemies with the M4

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

Defeat 20 enemies with gunfire by aiming while hanging

Defeat 30 enemies with Mk-NDI grenades

Defeat 100 enemies with headshots

Defeat ten enemies in a row with hand-to-hand combat

Defeat five enemies in a row with headshots