Not 100% but I'm 0retty sure the pure hero achievement can be achieved so long as you haven't lost your anal virginity but like I said, I'm not 100%.
The mouth fiend can be found by visiting the brothel, requesting a blowjob, and forcing a deepthroat. Do this twice, then head to the town square where you will meet a special young lady. The tavern scene can be found by visiting monsters (the second town) and visiting the tavern itself, purchase about 4 drinks, enough that someone actively flirts with you and then attempt to leave the building.
Which succubus btw, do you mean the vampire, the dullahan, the cameo demon, or maybe the vengeful ghost? I feel like any of these could be what your talking about unless sometging is slipping my mind.
I agree that money should be easier to come by.
I would also like to see a non combat version of the game, I haven't played story mode so idk if it overlaps but I would like to have a version where you simply have dialogue choices. Specifically for some of the goblin scenes because for the life of me I can never complete the orally satisfied ending for the goblin .
Oh I definitely think feedback is important even if you aren't a patron, but I know it goes a long way to get what you want if you get to vote on what's next.