Crab Killer
This little zombie crab is absolutely harmless, but hey it's a zombie crab, you better kill it!
First Blood
Technically zombies don't have blood. But whatever, kill one skeleton!
Demolition Expert
Destroy 100 enemies with grenades!
Mummy Smasher
Kill 100 mummies!
Vampire Smasher
This is not going to be easy. Kill 100 vampires!
I Hate Bats
Hardly an achievement... Get killed 25 times by bats.
Not Bad
Get 50 points in overall single player mode.
Good
Get 150 points in overall single player mode.
Great
Get 500 points in overall single player mode.
Badass
Get 1000 points in overall single player mode.
Superhero
Get 5000 points in overall single player mode.
Double Killer
Get double-kill action.
Triple Killer
Get triple-kill action.
Multi Killer
Get multi-kill action!
Precision Lvl1 Novice
Perform your first "Perfect Aim" action!
Precision Lvl2 Beginner
Perform your 5th "Perfect Aim" action!
Precision Lv3 Skilled
Perform your 15th "Perfect Aim" action!
Precision Lvl4 Master
Perform your 50th "Perfect Aim" action!