Complete the indicated task to unlock the achievement.

Achievement	How to unlock
100% Old Skool	Collect 100% of Pripp's artifact wishlist.
20 Seconds to comply...	Unknown.
50 Shades of death	Unknown.
50% Old Skool	Collect 50% of Pripp's artifact wishlist.
And stay down!	Knock down 10 enemies using 'Hog Rush'.
Anti-Mechanic	Decommission 10 'Mechanical men.
Bormin smash!	Kill an enemy by knocking them off a high place.
Butterfingers!	Kill an enemy by making the Pyro drop his Molotov.
Demo thing	Unknown.
Extraction	Unknown.
Fitness club	Unknown.
Freak Out!	Unlock all Mutations in each character's skill tree.
Frying tonight!	Kill 10 enemies using 'Chain Lightning'.
Get back to the Ark!	Return to the Ark!
Green fingers	Trap 10 enemies using 'Tree Hugger'.
Huntress	Unknown.
Lights out!	Unknown.
Matriarch	Unknown.
My bad	Kill a crew member.
Not a myth	Reach Eden.
Not-so-tactical nuke	Unknown.
Om nom nom!	Use 'Corpse Eater' to interrupt a resurrecting enemy.
Pfft! Too easy!	Reach Eden in 'IRON MUTANT' mode (Any difficulty).
QA have suffered!	Reach Eden in 'IRON MUTANT' mode on VERY HARD without losing a crew member.
Sent to the farm	Put 5 Zone Dogs 'to sleep'.
Still too easy!!!	Reach Eden in 'IRON MUTANT' mode on VERY HARD.
Survivor	Unknown.
Take out the Zone trash!	Kill 40 Ghouls.
Tastes like chicken	Unknown.
Tea Leaf	Unknown.
The power of flesh	Possess 10 enemies with 'Puppeteer'.
Thoughtful warrior	Unknown.
Unfriended	Taunt a crew member who is under mind control.
Unnaturally successful	Unknown.
Weapon smith	Improve 5 upgradable weapons to level III.
Zone Master	Obtain all achievements!