Kill 3 zombies with one shot using the sniper rifle

Kill 3 zombies in 3 seconds using the pistol

Kill a zombie from a really short distance using the shotgun.

Apply damage to 5 zombies without releasing the trigger using the laser gun.

Complete all the official map challenges.

Kill a zombie from a long distance using the assault rifle.

Accumulate 20,000 credits in the game.

Buy all of the items from the in-game shop.

Shoot 1,000 times on a single match.

Complete a classic map without killing a single zombie.

Kill 1,000 zombies

Upload a map to the workshop.