1

If a game that uses the Google Play Games service disappears, are the associated XP and achievements removed from the Google Play Games' player profiles?

2

If by disappering you mean deleted app from playstore, No an app can't be deleted once published in google play store(Ref.). The "Delete" button only works for unpublished version of your app. It shoud instead be unpublished and wont be displayed in the PlayStore results but the old users will continue using the apps and receive updates. See here

When you unpublish an app, existing users can still use your app and receive app updates. Your app won’t be available for new users to find and download on Google Play.

And once an achievement is published it cannot be deleted (Ref.). But you can reset the players achievement's progress in the google play developer console or by using the Management API methods programatically only when the app is published.

Deleting an achievement

Once your achievement has been published, it cannot be deleted.

You can only delete an achievement in a pre-published state by clicking the button labeled Delete at the bottom of the form for that achievement.

Resetting an achievement

You can only reset player progress data for your draft achievements.

To reset achievements in the Google Play Developer Console, click the button labeled Reset achievement progress at the bottom of the form for that event. To reset achievement data programmatically, call the Management API Achievements methods... Read More

So that means the app won't be listed in the playstore results for new users but the game data will be stored for the users having installed the app before the app is unpublished.

0

The XP and achievements stay on your profile forever (unless you delete the game from your profile).

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