Kill 20 zombies in a row using only slide-kick attacks
Kill over 1000 zombies
Get x5 score-multiplier
Retrieve five crossbow bolts from dead zombies
Died 100 times and still here
Complete level without taking any damage
Complete level without killing a single zombie
Complete any non-tutorial level
Kill 30 zombies in a row using only blunt weapons
Acquire all the available weapons
Upgrade all player abilities to maximum levels
Complete every level available in the game
Complete game on easy difficulty
Complete game on normal difficulty
Complete game on hard difficulty
Kill 5 or more zombies in one shot
Kill 20 zombies in a row using only melee attacks
Kill 50 zombies in a row using only firearms
