Kill 10000 zombies!
Kill 10 Zombies!
Kill 2500 Zombies!
Kill 5000 Zombies!
Kill 50 Zombies!
Kill 100 Zombies!
Kill 500 Zombies!
Complete Wave 3!
Complete Wave 1!
Complete Wave 5!
Complete Wave 8!
Complete Wave 15!
Complete Wave 10!
Complete Wave 20!