Xbox Mythic Achievement appears in Xbox PC app with 15-second unlock sound

The feature is being compared to the Platinum Trophy on PlayStation, but Microsoft has not officially confirmed it.
Sources also mention a new icon and an unlock sound of around 15 seconds; TrueAchievements says the reward may be 0 Gamerscore and possibly retroactive.

What happened

According to reporting from Eurogamer and TrueAchievements, a new Mythic Achievement has shown up in an update to the Xbox PC app. The discovery is linked to Xbox insider and leaker Klobrille, who posted on X that the app now shows a new symbol and an unlock sound for the feature.

The new reward is being framed in coverage as a possible Xbox equivalent to the PlayStation Platinum Trophy. However, the available information does not make it clear exactly how the feature will work. It is still unknown whether Mythic Achievements will only appear after all other achievements in a game have been earned, and whether the feature will be available on PC, consoles, or both.

TrueAchievements also reported that Mythic Achievements are said to be worth 0 Gamerscore and may be retroactive. A separate detail mentioned an unlock sound lasting about 15 seconds. That information comes from the reported app update and has not been officially confirmed by Microsoft.

Microsoft itself has not made a formal announcement in the sources provided. Background reporting does reference earlier comments from Xbox lead Asha Sharma, who was said to have suggested that a Platinum-like feature could arrive later this year, alongside a broader overhaul of the achievements system.

Timeline

2026-09-22 — Klobrille posts on X that an update to the Xbox PC app shows a new Xbox Mythic Achievement, including its symbol and unlock sound.
2026-09-22 — The same X post describes the Mythic Achievement as a possible reward for 100% Gamerscore game completion.
2026-09-23 — Further reporting links the discovery to a possible Xbox counterpart to the PlayStation Platinum Trophy.
2026-09-23 — TrueAchievements reports that the feature is said to be worth 0 Gamerscore and may work retroactively.
2026-09-24 — The available sources still do not include an official confirmation from Microsoft.

Background

The term Mythic Achievement fits into a broader discussion about a possible Xbox version of the Platinum Trophy, a reward on PlayStation that is often seen as marking full completion of a game. The sources provided make that comparison several times, but there is no official Microsoft description confirming that the feature will follow the same rules.

The background also points to an earlier announced achievement overhaul from Microsoft. For now, though, the main story is what has surfaced in the Xbox PC app: a new icon, an unlock sound, and a name that has not yet been officially explained.