Hello there!
My Family will buy (one) Google Stadia Pro, but we don´t know if every person can have his own achievements for a game. Does every each profile have his own achievements or how does it funktion?
Like:
Buy Red Dead Redemption 2 and every Person will have his own achievments on this one game.
Family sharing hasn't been released yet, so until that happens then the options are still somewhat limited. If each player wants to have their own set of achievements then currently each player would need their own account, and they would need to purchase each title under those accounts (as Family Sharing isn't available yet). Additionally, if 4K/5.1 audio is required then it would also be necessary to purchase a Pro subscription for each account too.. Starts to get expensive....
Basically, it's not a practical situation until such time as family sharing is released imho.
https://support.google.com/stadia/answer/9575790?hl=en&ref_topic=9495322
Found this today. Seems to indicate that Family sharing is imminent if not already quietly released (perhaps as Stadia is starting to allow sign ups for all). Gonna do some testing on this over the weekend.