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

Defeat 50 enemies with the 92FS - 9mm

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

Complete one Cooperative Multiplayer game

Finish the game in Easy Mode

Finish the game in Hard Mode

Defeat 100 enemies with headshots

Defeat 70 enemies with the M4

Find 20 treasures

Defeat 20 enemies with the Pistole

Find ten treasures

Defeat 50 enemies with hand-to-hand combat