problems with achievments on gamepass

Hello, I have been having trouble many times with achievments not activating on gamepass. For example I played a game called Fireworks whose only achievments are to complete the game chapters, so they are qute easy to get. Yet, after completing the game, two achievments were missing, one involving listenting to the ending music, which I did.Sometimes, achievements activate but with a long delay. Why is the achievment system more flawed than on Steam?