Steam has never been particularly good at keeping secrets, and the platform’s latest blunder may be one of its biggest yet. A third-party achievement tracking website appears to have inadvertently exposed achievement lists for a massive number of upcoming PC games — including titles that publishers have never officially announced. Among the biggest names caught in the data dump: Persona 6, Ace Combat 8, and a surprising new campaign connected to the classic stealth game Thief: The Dark Project.
How the Leak Happened
Here’s how it works behind the scenes: developers routinely upload achievement data to Steam’s backend long before a game is announced or released. It’s simply part of preparing a build for launch. Normally, this data sits invisible behind unreleased, unnamed app IDs that the public can’t easily connect to any specific game.
However, a third-party site that aggregates Steam achievements apparently made some of this hidden information viewable. Dataminers quickly seized the opportunity, cross-referencing exposed app IDs and achievement lists against Steam’s database. The result was a virtual treasure map of forthcoming PC releases — some already announced, and others that were supposed to remain complete surprises.
Why Achievements Are a Dataminer’s Goldmine
Achievement lists might not sound exciting, but they can reveal a lot: chapter names, difficulty modes, story beats, hidden endings, and even the overall scope of a game. For sleuths tracking unannounced projects, an achievement list surfacing on Steam is often the first hard proof that a game actually exists and is deep enough in development to have its progression systems finalized.
The Big Names Hiding in the Data
Persona 6
The most headline-grabbing discovery is arguably Persona 6. Atlus’s flagship RPG series has a massive global following, and fans have been patiently waiting for a proper mainline sequel since Persona 5 arrived in 2016. Achievements appearing in Steam’s ecosystem strongly suggest the PC version is actively being prepared — welcome news for anyone hoping the next Persona launches day one on Steam, following Sega and Atlus’s increasingly PC-friendly release strategy.
Ace Combat 8
Bandai Namco’s beloved aerial combat franchise also appears in the leak. An achievement set tied to the next numbered Ace Combat entry indicates the project is far enough along to have its progression hooks locked in — and that PC players are firmly in the publisher’s plans for the next flight into the stratosphere.
A New Thief: The Dark Project Campaign
Perhaps the most unexpected hint is a new campaign referencing Thief: The Dark Project, the legendary 1998 stealth game from Looking Glass Studios. Whether this points to a remake, a remaster, or entirely new content set in the classic saga, it suggests Garret’s shadowy world may be creeping back toward modern PCs — a prospect that should thrill old-school stealth fans.
What This Means for Gamers and Publishers
Leaks like this are a double-edged sword. Players get early confirmation of games they’re desperate to play, but publishers lose control of their carefully choreographed marketing reveals — and achievements can unintentionally spoil story details months or years before launch. It’s a safe bet Valve will tighten how third-party sites access its achievement API, though history shows that where there’s Steam data, determined dataminers will follow. It’s also worth remembering that achievement lists don’t guarantee a release date; builds can languish in Steam’s backend for a long time before going live.
In the meantime, if the leak has you eager to revisit the Persona catalog, catch up on the Ace Combat series, or replay the classic Thief trilogy while you wait, you can grab Steam gift cards and game codes at discounted prices at TURGAME.com and top up your wallet instantly.
Source: PC Gamer