To turn off sharing achievements to activity feed on Xbox Series X|S, follow these steps:
Press the Xbox button on your controller to open the guide.
Go to Profile & system - Settings - Preferences - Activity feed.
Uncheck “Achievement Notifications On” on the Achievement Notifications settings page.
Exit Settings.
If you want to manage your activity feed privacy further, you can adjust your settings to control who has access to the screenshots, game clips, achievements, or broadcasts that you share online. You can also hide a post in your activity feed if you don’t want it to be visible to others
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