Complete the indicated task to unlock the achievement.

Achievement	How to unlock
(D-Day + 356) Unblock the rock wall	Find all the Buddha's to continue on your quest!
100 head-shots	In single or multi-player games.
Burn 500 zombies	Pick up the "Nuke" perk to burn 500 zombies.
Early Access Champion	Killing zombies before the masses.
Make 100 Crawlers	Remove the legs of 100 zombies!
Melee through 500 zombies	Unknown.
Slaughter 100 zombies using melee weapons	Unknown.
Stay alive for 1000 zombies	Be alive in game, when the 1000th zombie spawns...
The Runner	Run 1Km.
Use a perk for the first time	Unknown.