User blog comment:ZXntle/Things to Do/@comment-33938903-20181106173206

Get every achievement, defeat all the bosses and minibosses, get every expert mode drop, collect atleast 5 of every treasure bag, (except lunatic cultist, as that one is unobtainable) and get one of every weapon, tool, accessory, and material.

I know it sounds hard, but it's relatively simple if you're already endgame.