Was going to try that All Achievements category, but I could only reset the advanced chambers, by deleting a few files. Didn't see one for achievements and the other challenges.

Did you ever figure out how to reset them? All I've been able to find so far is third party software to reset it on steam, which I'd prefer not to use.

I made a second steam account to use such software on. Also let's me use the steam overlay during streams without having to mess with my notification settings.

Use Steam Achievement Manager, no way to reset them in-game alone I think.

Thanks, will try on second account.

Cant Steam detect that youre using SAM and punish you for 'cheating'?