Complete the indicated task to unlock the achievement.

Achievement	How to unlock
Assassin	Kill 100 players.
Corpsekiller	Kill 1000 zombies.
Exterminator	Kill 10 000 zombies.
God of War	Kill 100 000 zombies.
Hunter	Kill 1000 boars.
Mission Veteran	Complete Nuke, Alien Threat and Rescue missions.
Veteran	Get 100 000 XP.