Kill 100 zombies using the handgun
Kill 100 zombies using the revolver
Kill 100 zombies using the shotgun
Kill 100 zombies using the auto shotgun
Kill 100 zombies using the SMG
Kill 100 zombies using the axe
Kill 100 zombies using the baseball bat
Kill 100 zombies using the katana
Unlock all checkpoints in level 1
Unlock all checkpoints in level 3
Unlock all checkpoints in level 2
Unlock all checkpoints in level 4
Unlock all weapons
Unlock all hats
Buy all upgrades