I just finished Bright Memory Infinite and none of the achievements worked at all.

I noticed the same. Unfortunately one of the latest updates must have broken achievements. I already informed the publisher and teh dev ... no idea if it helps but let's hope. If you are using Galaxy however you can rollback the game to version 1.06 - in this version the achievements do still work. I replayed the game on ver 1.06 and achievements unlocked without any problems.

Good news regarding the broken achievements (broken bacause of an update) for "Bright Memory Infinite". Just got a reply from the publisher Playism:

"I am sorry for the wait.
As we checked with the developer team, the update will be conducted accordingly.
We will update you on Twitter as soon as it is done.
We apologize for the inconvenience caused. Thank you for your patience."

Just to confirm: The recent update version 1.2 which dropped on 2022-10-19 fixed the achievement problems. I played it yesterday for the first time and was able to unlock everything without problems.