ACHIEVEMENT - HOW TO UNLOCK
A Legion Of Zombies - Kill 500 Zombies in one level.
Back with the Ex - Witness Rachel joining the group.
Big Brain Brian - Witness Brian joining the group.
Can't Touch This - Complete a base quest without taking any damage.
Fist Of Fury - Kill a Mutant with your fists.
Getting to know each other - Complete ALL character quests.
Kill a Zombie - Kill a Zombie.
Master Craftsman - Fully upgrade a weapon with any status effect.
The Collector - Complete "Dev Card Hunt".
Thought this was a Zombie game? - Witness Luxo joining the group.
Touch Base - Complete "Return to the Military Base".
Watch This! - Use your first Smart Bomb.

"Scorepocalypse" achievements
ACHIEVEMENT - HOW TO UNLOCK
Graveyard Bronze Medal - Achieve a Bronze Medal on Graveyard
Graveyard Dev Medal - Beat the developer at their own game on Graveyard!
Graveyard Gold Medal - Achieve a Gold Medal on Graveyard
Graveyard Silver Medal - Achieve a Silver Medal on Graveyard
Mall Bronze Medal - Achieve a Bronze Medal on Mall
Mall Dev Medal - Beat the developer at their own game on Mall!
Mall Gold Medal - Achieve a Gold Medal on Mall
Mall Silver Medal - Achieve a Silver Medal on Mall
Suburbia Bronze Medal - Achieve a Bronze Medal on Suburbia
Suburbia Dev Medal - Beat the developer at their own game on Suburbia!
Suburbia Gold Medal - Achieve a Gold Medal on Suburbia
Suburbia Silver Medal - Achieve a Silver Medal on Suburbia
Town Square Bronze Medal - Achieve a Bronze Medal on Town Square
Town Square Dev Medal - Beat the developer at their own game on Town Square!
Town Square Gold Medal - Achieve a Gold Medal on Town Square
Town Square Silver Medal - Achieve a Silver Medal on Town Square