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