Xbox tests Mythic achievements in Xbox PC app with nearly 15-second unlock sound

• According to reports, Mythic is meant as a reward for unlocking all base achievements in a game.
• The unlock moment would get a separate symbol and a sound effect that lasts nearly 15 seconds.

What happened

On September 22, 2026, Klobrille reported on X that an update to the Xbox PC app shows an Xbox Mythic Achievement, including a plus symbol and an unlock sound. In the same post, the feature was described as a reward for a game completed 100%. The embedded tweet specifically says the new Xbox PC app update reveals an Xbox Mythic Achievement and that it is expected as a 100% Gamerscore game completion reward.

Kotaku later wrote that Mythic achievements, according to the app data that was found, function as a completion reward. The publication said you first have to unlock all other achievements in a game before Mythic is awarded. In that coverage, the new category is compared to PlayStation Platinum trophies, a comparison The Verge also made in a separate article. The Verge described Mythic as Xbox’s own version of PlayStation’s platinum trophies and likewise reported that the feature surfaced through an update to the Xbox PC app.

According to the same reports, Mythic achievements are tracked separately from standard achievements, and DLC achievements would not affect them. It was also reported that the new reward is worth 0 Gamerscore. That detail appears in the coverage in part through a reference to TrueAchievements. The unlock moment would also get a new animation and a sound effect that lasts nearly 15 seconds. Kotaku explicitly described that sound in the article title as an unlock noise that goes on for 15 seconds, while The Verge said the Mythic Achievement has its own unlock sound.

The available information therefore suggests that Microsoft or Xbox has not officially announced the feature yet, and that the discovery comes from app data and reporting by multiple outlets. In the source material, the feature is mainly tied to the Xbox PC app on Windows, not to an official console rollout.

Background

The comparison to PlayStation Platinum trophies comes from reporting, not from an official Xbox statement. In the available sources, Mythic is mainly tied to the Xbox PC app, so it is not yet clear whether the feature will also appear on console at launch. The Verge placed the discovery in the context of Microsoft’s broader Xbox app on Windows, where the company is also adding other PC gaming features.

Other details have not been officially confirmed either. It is unclear whether the nearly 15-second sound effect is final, whether all games will get a Mythic achievement, and whether the 0 Gamerscore value will apply in every case. The reports do describe the feature as a completion reward for earning all base achievements, but the exact implementation could still change before a wider rollout.

The source material also shows that the claim is based on a combination of app discovery and social posts. Klobrille’s tweet mentions the Xbox PC app update and the expected completion reward directly, while Kotaku and The Verge then expanded on the discovery in editorial coverage. So the core of the story right now is that a new achievement layer is visible in the app data, not that Xbox has already fully and officially launched the feature.

Sources

• Kotaku: "Xbox’s New ‘Mythic’ Achievement Features An Unlock Noise That Goes On For 15 Seconds"
• The Verge: "Xbox's Mythic Achievements sound like PlayStation's Platinum trophy"
• X post by @klobrille about the Xbox PC app update and Mythic Achievement