Complete the indicated task to unlock the achievement.

Achievement	How to unlock
Barrels O' Fun	Kill five enemies with an explosive barrel.
Case closed	Unknown.
Don't tell David	Unknown.
Great Minds Think Alike	Kill a Ghost with the prop they're currently holding.
Hail Mary	Decapitate an enemy with a hatchet from over twenty meters away.
Heh heh heh... thank you	Spend $15,000 in the shop in a single Survival match.
Here's lookin' at you	Kill an enemy with an eyeball.
How	Clear a map without taking any damage.
It is done	Clear Chapter One on Extreme.
Ma'am I do my own plumbing	Clog a toilet with body parts.
Melon Popper	Pop 250 enemy heads.
My deepest shame	Unknown.
No Scope Cope	Headshot an enemy from fifty meters away with the pistol.
Not today, thank you!	Deflect 25 thrown hatchets.
Ow	Unknown.
Prop Sniping	Kill an enemy with a chair from over 25 meters away.
Rescue Mission	Unknown.
Return to Sender	Reject an incoming TNT delivery.
Secret Hunter I	Find all secrets in Chapter One.
Stack 'em Up	Get two or more headshots with a single Lever Action shot.
The Gungineer	Fully upgrade a weapon.
There's no time for resting	Rest on the throne.