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