Let 20 opponents slip.
Complete level 5.
Find 5 weapons.
Reach a score of 15,000.
Beat 64 enemies.
Let 10 opponents slip.
Kill a "police officer" zombie.
Kill a "clown" zombie.
Kill a "hotdog" zombie.
Complete level 3.
Reach a score of 10,000.
Reach a score of 5,000.
Beat 32 enemies.
Collect 12 bottles.
Find 2 weapons.
Collect 6 bottles.
Kill a "firefighter" zombie.
Let 1 opponent slip.
Beat 12 enemies.
Find 1 weapon.
Complete level 1.
Collect 1 bottle.