Complete the indicated task to unlock the achievement.

Achievement	How to unlock
Acid Doctor	Inject acid into 20 enemies.
Brainless	Never give up!
Chainsaw Massacre	Cut off 100 parts of your enemies.
Chainsaw Slaughter	Cut off 10 parts of your enemies.
Chicken Wings	Hold on to chickens for 30 minutes.
Fallen Villain	Find Hans.
I Believe I Can Fly	Hold on to chickens for 1 minute.
I Believe I Can Touch The Sky	Hold on to chickens for 10 minutes.
Keep Rolling	Survive one minute as head.
Keep Rolling Rolling	Survive 10 minutes as head.
Keep Rolling Rolling Rolling	Survive 60 minutes as head.
Meat Boy	Produce 10 meatblocks.
Meat Man	Produce 100 meatblocks.
Meat Master	Produce 1000 meatblocks.
Meet Ben	Meet Ben.
Met An Old Friend	Create Ed.
Pogo God	Unknown.
Pro Gamer	Finish the tutorial.
Rotten but famous	Beat all singleplayer maps.
Shadow Of Hans	Build your own map.
Trashmaster	Place 50 Trashcans.
Tremendous Chainsaw Escalation	Cut off 1000 parts of your enemies.
Use Your Head	Finish a race headless.