Unlock all other trophies
Clear all levels in zone 1 on Easy difficulty
Clear all levels in zone 1 on Normal difficulty
Clear all levels in zone 2 on Easy difficulty
Clear all levels in zone 2 on Normal difficulty
Clear all levels in zone 3 on Easy difficulty
Clear all levels in zone 3 on Normal difficulty
Kill one or more zombies
Kill two or more zombies with a shot
Kill five or more zombies with a shot
Kill ten or more zombies with a shot
Kill fifteen or more zombies with a shot
Kill twenty or more zombies with a shot