Here is the full list of all 11 Orbo's Odyssey achievements.
Return to nothing at the Monolith.
Collect All Obol Fragments
Discover the dev room.
Enjoy Chef Jett's Delicious Special...
Beat the game...?
Defeat S3R.gen...
Finish engineering the prosthetic arm.
Complete every time trial, beating the developer ranks.
Complete every time trial, beating the green ranks.
Knock over every dog in Shlarp City...