Reach wave 5
Reach wave 100
Reach wave 25
Kill 25 zombies with a grenade
Kill 25 zombies with a claymore
Get a multiplier of 6
Get a score of 20,000
Get a score of 50,000
Get a score of 100,000
Die 100 times
Kill 5,000 zombies
Play with 4 players
Max your stats
Have 25 pistol clips
Have 20 semi-auto clips
Have 50 shotgun clips
Have 3 flamethrower cans
Shoot a claymore