Complete any non-tutorial level

Died 100 times and still here

Kill over 1000 zombies

Get x5 score-multiplier

Kill 5 or more zombies in one shot

Complete level without taking any damage

Complete level without killing a single zombie

Kill 20 zombies in a row using only melee attacks

Kill 20 zombies in a row using only slide-kick attacks

Kill 50 zombies in a row using only firearms

Kill 30 zombies in a row using only blunt weapons

Acquire all the available weapons

Retrieve five crossbow bolts from dead zombies

Upgrade all player abilities to maximum levels

Complete every level available in the game