A massive Steam leak has reportedly exposed achievement lists for a large number of upcoming games. The leak includes at least 15 projects that have yet to be officially announced, alongside major titles such as Kingdom Hearts IV, Persona 6, Fable and Gears of War: E-Day.
The information surfaced through Exophase, a website dedicated to tracking Steam achievements. The scale of the leak is particularly notable, with at least 145 games currently appearing in the leaked data, and the total could potentially grow.
The biggest concern involves story driven games, as achievement descriptions can sometimes mention characters, bosses and important plot events. As a result, some of the leaked information may already contain spoilers for highly anticipated games that are still months or even years away from release.

Among the most notable titles reportedly affected are Persona 6, Kingdom Hearts IV, Gears of War: E-Day, Silent Hill: Townfall and EA Sports FC 27. Players expecting these games are therefore advised to be careful when browsing Reddit, X and other social media platforms, where potential spoilers could spread quickly.


The leak is even more interesting because it appears to include several projects that have never been officially announced. These reportedly include an unknown Sonic game, a Star Wars shooter, a Telltale The Walking Dead collection, a Dune game and a Nickelodeon life sim inspired by Animal Crossing, among others.

Another particularly interesting entry is a THQ Avengers game that was previously cancelled. Its appearance in the leaked data suggests the project may have returned to development. Earlier this week, insider Daniel Richtman also claimed that a new Avengers game is currently in development.
However, the presence of a project in the leaked achievement database does not necessarily mean that it is still actively being developed. Some of the games could have been cancelled, shelved or abandoned.
It remains unclear how Valve and the affected publishers will respond to the leak. Given the sheer number of games involved, the situation could develop further in the coming days.
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