Here is the full list of all 10 ibb & obb achievements. It takes around 10-12 hours to unlock all of the achievements on Windows.
Get the highest possible score on all levels.
Find ubb and make him king.
Collect all hidden crystals.
Visit all regular and secret levels.
Make it to the party at the end of the game.
Bounce a Fin back and forth 10 times.
Fall through six different warps without landing.
Get the highest possible score on a level.
Finish a level without dying.
Collect a hidden crystal.