Overview
- The feature began rolling out to Xbox Insiders on Tuesday, September 29, with testing confined largely to higher Insider rings such as Alpha and Alpha Skip‑Ahead.
- A Mythic Achievement is awarded once a player earns every original, base‑game achievement for a title, and the Mythic status is permanent for that account.
- Xbox says Mythics are being applied retroactively to eligible games, including some Xbox 360-era titles, though retroactive grants may not play the new unlock animation or toast.
- New UI elements support the system: a Gaming tab on profiles, a per‑game progress bar that highlights remaining original achievements, and a heroic frame and unique sound for Mythic unlocks.
- Microsoft has not published a full list of eligible games or a public release date, so broader rollout will depend on Insider feedback and the usual phased system update schedule; the change gives completionist players visible rewards and social signals across profiles.