How I can disable achievement window in game? Xbox series S

Do you mean the pop-op when you get an achievement or is there a list of achievements on your screen when playing the game?

Press the Xbox button the controller and scroll right to the Game Activity tab. Go to Achievements and turn off the achievement tracker.

Hi,

• You can play disc based Xbox One and BC games on a Series X. The Series S does not have a Blu-ray drive. Series S is a digital only console. You can't play discs on it.
• Xbox accounts work on Xbox 360, Xbox One, Windows 10, Series X and S. All you need to do is sign in. All your digital games/DLCs, achievements and save games come with you. You don't need a separate account for Series X/S. In addition, your Xbox account
  will continue to function on any of your old consoles. You just won't be able to sign in on two devices with one account at the same time.

The only way to delete you achievements is ONLY on the 360. I dunno how to do it on Windows 10 or the Windows 10 Dash update. My point of view, ALL achievements should be disabled.

short answer: yes

long answer: How to expand Xbox Series X, Series S storage with an external drive | Windows Central