I sincerely hope that no one has to go through getting this on a legitimate run; I did :(. I do not recommend aiming for this when you have other end game achievements to accomplish.
You will need to get from level 100 to level 10; as this is a rogue-like, that's not always a guaranteed or easy accomplishment. You will then need to throw your hard work to the wayside by dying on any level from 1-10.