As for Krampus, you have to kill a lot of "innocent" animals in a short amount of time. Each kill increases your "naughtiness" rating, but each minute or whatever of no bad actions decreases it. So if you just go on a rabbit killing spree and kill about...say 15 of them in a short amount of time, you'll start hearing some hissing and if you keep it up, Krampus will show up and you will womp on his ass. I've killed him twice, but he hasn't dropped his bag yet, which is what I want.