Begin rebeefing the cow.
Continue rebeefing the cow.
Rebeef the cow a little further.
You've reversed the beef!
Reach the bonus stage.
Rebeef the bonus boss.
Unlock the deleted cutscene.
Unlock both bonus levels and the bonus boss all without dying. Boxing glovedness is on the honor system.
In the second bonus stage, collect 25 Homestars in a row without missing any.