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.
Bounce a Fin back and forth 10 times.
Fall through six different warps without landing.
Find ubb and make him king.
Make it to the party at the end of the game.
Get the highest possible score on all levels.
Collect all hidden crystals.
Visit all regular and secret levels.
Collect a hidden crystal.
Get the highest possible score on a level.
Finish a level without dying.