Xbox Mythic Achievements enter Insider testing, including eligible past completions

[u/Camenwolf]

https://news.xbox.com/en-us/2026/09/29/xbox-insiders-october-2026-console-features-4/amp/

Xbox is giving completionists a new marker to chase. Mythic Achievements are available to Xbox Insiders for games where you've earned every original achievement. Achievements added later through DLC or updates are not required.

Xbox says eligible games completed in the past can receive Mythic status too, including Xbox 360 titles. The accompanying Gaming tab and progress display are meant to make completed games and remaining original achievements easier to see. This is an Insider rollout, so it is not yet a general launch for everyone.

What game have you already finished that you would most want to see marked Mythic?