Collecting all coins in a level is not something that is tracked, or expressed as collected anywhere, so skipping them is a valid thing we use in runs. Perhaps all coins would be a good idea for this. Additionally, levels or worlds (sets of 3 levels I suppose) without taking damage? Low number of berry throws/jumps? There are plenty of challenges you can choose for yourself, hope you have fun doing whatever! GL

I'm pretty sure you can beat the game without butt bouncing once. Try that out.