Better late than never--Xbox's answer to the platinum trophy is finally here, and Microsoft details how its new Mythic Achievements work.

Mythic Achievements are now available to Xbox Insiders testing, with a wider rollout on the way. The new unlock is essentially a digital milestone that commemorates a player's mastery of platform-level meta sidequests, aka achievement hunting.
Mythic Achievements are rewarded when gamers get all previous accomplishments in a given title, and the unlocks are retroactive. So if you 100% completed Halo 3 ODST, including the Vidmaster Challenge, back in 2010, you'll still get that Mythic Achievement today in 2026.

DLC doesn't count for these new high-level unlocks--only the base game is included--so gamers won't have to worry about buying anything extra or playing a bunch of content to unlock the status symbol.
One somewhat disappointing tidbit: Retroactively-earned Mythic Achievements don't get pop-up animations. So if you already 100%'ed something like ODST, the new-and-improved Mythic Achievement animation won't play when you start up the game. Those pop-ups (referred to as "toasts" by Microsoft) only happen when you first unlock the Mythic Achievement.
You have to be part of the Xbox Insiders program to try this out, so be sure to sign up here.
Check below for more tidbits from Microsoft:
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How can Xbox players find retroactively awarded Mythic Achievements on their profiles?
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Whether you've spent years chasing every achievement, or are simply proud of the games you've finished, Mythic Achievements recognize some of the biggest accomplishments in your XBOX history.
You earn a Mythic Achievements when you complete all original achievements for a game. Achievements added later through DLC or updates aren't required, and once you've earned Mythic status, it's yours to keep.
And your history comes with you. Mythic Achievements have already been added to eligible games you completed in the past, including XBOX 360 titles. So, the next time you visit your profile, you may discover that some of your favorite games have already reached Mythic status.
And your history comes with you. Mythic Achievements have already been added to eligible games you completed in the past, including XBOX 360 titles. So, the next time you visit your profile, you may discover that some of your favorite games have already reached Mythic status.








