I got everything save the sacrifice ending. Here is how.
Bonus: wait in the starting cell.
For enemy loss scenes, every enemy type (rat, goblin, hound, boar, and orc) has the same conditions for each of their scenes.
Boss: you may have to reload certain boss floors as some have more than one possible boss. Floor ten is goblin/rat floor 20 is hound/goblin, floor 27 is boar/orc etc
Key keeper: In some cases such as goblin it must not be a the archer variant. It must be a key keeper warrior. You can find rat and goblin key holders in floors 1-9 randomly, boars and hounds beyond that, and an orc key holder always appears on one of the final floors (I believe 25 or 27)
Regular: These are everything else (Neither key keeper nor boss)
Some enemy types have two of these. I believe its based on which variant kills you.
First time: Same as above but only on the first time.
for endings there is...
Escape: beat him and leave.
Qaron: two firsts. First loss to him.
Qaron: sacrifice
I am unsure about Qaron: sacrifice. I have unlocked everything else, I have escaped again and lost to him again (It seems to be bugged as it treated my loss to him as though it was an orc. I got one of the orc endings.) That or this ending is not yet implemented so it uses orc: interrogation as a placeholder.