Kill 1,000 zombies
Dress up 1,000 times
Execute 1,000 zombies
Headshot attack 2,000 times
Complete Story Mode using only melee weapons
Complete the abandoned hangar without killing any enemies
Complete Story Mode without loading progress
Complete Story Mode in 30 minutes
Do not use the Zombie Brain Smasher to complete the Centralized Control Area.
Complete Story Mode without taking damage
Clear the Test Grounds without taking damage
Throw a weapon to kill a zombie from 10 meters away
Kill 100 Weeper
Complete the Weeper's Challenge with a revolver.
Stomped 500 zombies to death
Get grabbed by zombies 300 times
Destroy 100 venom chunks spewed by the Squirters
Kill 2 zombies 100 times with one bullet
Kill 3 or more zombies with one bullet