Here is the full list of all 26 rooMaze achievements.
Complete the "Leper" difficulty
Equip all of the M.I. clothes
Equip the Bolt_O_Throw V4.8
Eat the disgusting meat shield...
Complete the normal difficulty
Learn the mage mastery
Banish the evil out of the dark picture
Locate mushroom investigation
Trunsmuffinicate something
End the Twizzys shenanigans
Have a nice time in a mushrooms party
Equip the crystall lamp
Equip the shoulder bag
Unlock the hotel storage
Loose some health with unknown potion
Complete the easy difficulty
Kill the Usurper
Find a first aid kit
Equip the Bolt_O_Throw V15.16
Unlock the Check-point storage
Forget skill points and clear your mind
Learn the ranger mastery
Have some recovery near barstand
Restore health with unknown potion
Descent a little, like it wasn't enough