Infiltrate the snowy mountain side base.

Defeat 50 enemies with hand-to-hand combat

Defeat 20 enemies with headshots

Gained 5 or more seconds of hang time in a single jump - any mode

Killed a Tollusk using only Ground Urchins.

Kill at least 3 enemies with a single shot from a grenade launcher in Single Player or Special Ops.

Defeat 20 enemies with hand-to-hand combat

Purchased 1 upgrade in the Motor Forge

Completed "Exploited in the Bowels of Hell"

Kill the away team Zombie.

100 Chainsaw Combos.

Fill the screen with the maximum amount of blood on any level.

Complete a mission using only melee attacks