Make 10 Spiders flip belly-up.

Complete the game in Spartan Mode.

Kill 30 enemies with a flamethrower.

Kill 50 Watchmen.

Win a multiplayer match with a 20-second-per-turn time limit.

Use 10 Lever Switches.

Escape from the Red Line.

Escape the chasing Nazis on the REICH level without being caught once.

Choose three primary weapons that use different ammo.

Open your inventory.

Punch a tree until the block of wood pops out.

Kill 200 Mutants.

Kill 20 lurkers.