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