I got the “Expert Witness” achievement for finishing the game on Expert.
760/1000 Gamerscore in this game, and I think that’s about the limit of my capabilities. I don’t think the rest are within my reach (like getting S Rank in everything, or getting SS Rank in 10 things, etc). The only other achievement that’s possible is reaching Level 100. But considering I’ve been playing the game every day since I got my Series X and I’m only level 52, I’m not sure if that’s ever going to happen.
But hey, the game is really great, so I’ll keep playing, so maybe one day I will reach level 100. On the other hand, what I should do is to switch my daily music game to Rez Infinite. I got that last year and I still haven’t played it yet.