For those of you who are completionist psychopaths like myself, I've put together a spreadsheet "checklist" of all the currently available unlocks (costumes, scenes, upgrades etc.) in the most organized way I can think of, and I've just finished updating it for the new 2.1 release (assuming the changelog is accurate). Just a clear way to know what are all the available things, and if you download the sheet and highlight the appropriate boxes you can "check off" what you have already gotten/done. (Yes, I know the vault kind of does this, but this is a way for the player to consciously track what the hell they're doing and doesn't require 1.7 zillion clicks to navigate)
Theoretically speaking I'll continue to follow the development of SU and update the checklist accordingly.
-https://docs.google.com/spreadsheets/d/1lhqi5qeo2u8Vl-4358x9R4UIvJ2NqbEGXJyA025gZJA/edit?usp=sharing
FYI Link embedding to google sheets on this forum is dumb, and auto inserts the whole sheet into the post. Just copy/paste the URL and remember to take the - off the front.