Rift Keeper (UP)

I messed this up a couple of times - so expect not doing this first try. Use you basic weapon for good range, use to evade shots and use your spells/bows to kill anything from a bigger distance. In some cases it's better to be fast (like killing these nasty enemys on the floor) so they don't even have a chance to attack you. You only have to clear 70% so you can also leave enemys alone if you think they are more likely to hit you. I guess it's also possible to beat the first two bosses without getting hit.