All levels in zone 1 cleared on Easy
Ten or more zombies killed with a shot
Fifteen or more zombies killed with a shot
Twenty or more zombies killed with a shot
All levels in zone 1 cleared on Normal
All levels in zone 2 cleared on Easy
All levels in zone 2 cleared on Normal
All levels in zone 3 cleared on Easy
All levels in zone 3 cleared on Normal
One or more zombies killed
Two or more zombies killed with a shot
Five or more zombies killed with a shot