I'm going to try and do it without savescumming for the rat king at the start now (I've managed it for rat only, but not with the other 2 achievements too)
I usta like to try to kill the dragon without gettig the "Mine King" reward. You can kill him, just not claim the scroll or get the mine xp. No stamp, not part of the regular challenges, and it's not imposible, but certianly makes the end game way WAY WAYmore stressful.
Update: I managed it! It was indeed harder, but I managed to get the gnome earlier than usual by luck, and so did well enough that I could have even allowed the lovers to survive!