Is Achievement tracking broken again?

Wait for 24 to 72 hours In certain cases, achievements may not unlock immediately. The Xbox Live service may require additional time to validate the achievement unlocking process. As a general guideline, most achievements should be awarded within 24 hours. If they don’t appear, try restarting your console to synchronize all the necessary information related to the problematic achievements between your console and Xbox Live. In extremely rare cases, certain achievements may take up to 72 hours to appear on your profile.

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