Kill 500 zombies using the pistol
Kill 500 zombies using the revolver
Kill 500 zombies using the shotgun
Kill 500 zombies using the dual pistols
Kill 500 zombies using the Uzi
Kill 500 zombies using the rifle
Kill 500 zombies using the SMG
Kill 500 zombies using the minigun
Buy all guns
Unlock all characters
Buy all upgrades