Checking back in to say I've just about finally wrapped up everything I want to do.
Finished every level on Expert, and went back and got the extra 0 point achievements as well. Only achievement I have left to do is finish getting A-Ranks on all Isle 3 bosses (missing robot and medusa I think). The ultimate challenge would be all S-Ranks, but I don't think I have it in me, haha. I have S-Ranks on all of Isle 1, and have a few spread out randomly across Isle 2/3/Hell. My hats off to those of you who have done it all.
Anyway, like I've said every other time, this game is great and one of my favorites (if not absolute favorite) of the year. Anything this team does going forward has my immediate attention.