Kill 1 boss

Kill 2 bosses

Kill 3 bosses

Kill 4 bosses

Kill 5 boss

Kill 6 bosses

Finish the game

Pick up the "First aid kit" bonus

Pick up the "Acceleration" bonus

Pick up the "Protection" bonus

Pick up the "Pomegranate" bonus

Pick up the "Automatic" bonus

Pick up the "Shotgun" bonus

Pick up the bonus "Laser"

Die in the game

Kill any enemy

Fight off the first wave

Kill 100 zombies

Kill 100 skeletons

Hold out in the arena for 5 minutes