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