Full list of all 12 All Zombies Must Die! achievements worth 200 gamerscore. It takes around 8-10 hours to unlock all of the achievements on Xbox 360.
Kill a zombie
Kill 500 zombies in one level
Kill a mutant with your fists
Complete a Base quest without taking any damage
Use your first Smart Bomb
Fully upgrade a weapon with any status effect
Witness Rachel joining the group
Witness Brian joining the group
Witness Luxo joining the group
Complete all character quests or see someone else do it
Complete ‘Return to the Military Base’ or see someone else do it
Complete ‘Dev Card Hunt!’ or see someone else do it