i did have save corrupt at some point late act 2/early act 3 and i was able to find the save, copy it and rename it. then put it back in the correct spot and everything was good. got the achievement, golden dice, all that. it was incredibly disheartening and for basically the last half of my game i was unsure if it would “count” but it did so if that’s all that’s holding you back i wouldn’t worry too hard. just copy your save data whenever you quit for the day if you’re super paranoid