Defeat 30 enemies with the Desert - 5

Complete one Cooperative Multiplayer game

Finish the game in Easy Mode

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

Defeat 70 enemies with the M4

Defeat 100 enemies with headshots

Defeat 50 enemies with the 92FS - 9mm

Defeat 50 enemies with stealth attacks

Defeat 20 enemies with headshots

Defeat 20 enemies with hand-to-hand combat

Finish the game on at least medium difficulty.

Complete Act IV.