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