Singleplayer: Achieve 20 total knife kills

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

Throw 10 enemies into the Kamino generators.

Complete one challenge and receive at least a Bronze medal.

Defeat 50 enemies with the M32 - Hammer

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

Defeat 70 enemies with the M4

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

Defeat 30 enemies with the Wes - 44

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

Defeat 100 enemies with headshots

Break all of the coolant tanks aboard the Salvation without dying.

Disintegrate 15 enemies by throwing them into red force fields.