Kill 30 zombies in a row using only blunt weapons
Upgrade all player abilities to maximum levels
Acquire all the available weapons
Kill 50 zombies in a row using only firearms
Complete every level available in the game
Complete game on hard difficulty
Complete game on normal difficulty
Kill 20 zombies in a row using only melee attacks
Kill 5 or more zombies in one shot
Complete level without killing a single zombie
Complete level without taking any damage
Complete game on easy difficulty
Kill over 1000 zombies
Get x5 score-multiplier
Retrieve five crossbow bolts from dead zombies
Kill 20 zombies in a row using only slide-kick attacks
Complete any non-tutorial level
999
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