The Steam achievement leak 2026 has exposed private achievement lists for dozens of unannounced PC games via tracker Exophase, with Persona 6 achievements leak details spoiling its setting and story and confirming Kingdom Hearts IV, Ace Combat 8 and many more. If you want to stay spoiler-free, avoid searching the raw lists.
What Happened: The Steam Achievement Leak 2026 via Exophase
On September 8-9, achievement tracking site Exophase began surfacing Steam achievement sets that should have been private. The site pulls data directly from Steam's backend API, and suddenly games with no public store page or with hidden achievements were appearing with full names and lists. PC Gamer and GosuGamers both reported that the leak included Persona 6, Persona 4 Revival, Kingdom Hearts IV and Ace Combat 8 among many others.
This was not a breach of user accounts. It looks like a Valve-side API configuration slip that made private achievement data temporarily accessible to any authenticated API call. Exophase's automated scanner picked it up, as it does for any new AppID that publishes achievements.
“Seems like a possible screw up on Valve's end, a bunch of games with achievements that should be private are accessible through the API right now and that's why they got scanned into the site. I usually never see games without an actual name pop up with achievements, yet over the past hour or so a bunch have.”
— Exophase owner via ResetEra / MP1st
Valve has not issued a public statement yet, and the lists are still being mirrored on Reddit and Gematsu roundups. Because achievements are often uploaded months before launch for testing, the data is likely real but not final - names, descriptions and requirements can still change before release.
Full List: Every Game Spotted in the Exophase Steam Leak List
The Exophase Steam leak list keeps growing as scanners find more AppIDs, but the core set reported across GosuGamers, MP1st and PC Gamer is already massive. It mixes highly anticipated sequels, remasters and completely unannounced games leaked on Steam for the first time.
Reported titles with achievement data exposed include: Persona 6, Persona 4 Revival, Kingdom Hearts IV, Ace Combat 8: Wings of Theve, Control Resonant, Deus Ex Remastered, Dragon Ball Xenoverse 3, Dynasty Warriors 3: Complete Edition Remastered, Grave Seasons, Horizon Hunters: Gathering, Judas, Kena: Scars of Kosmora, Professor Layton and the New World of Steam, Squadron 42, Stranger Than Heaven, Thief: The Dark Project Remastered, Tomb Raider: Legacy of Atlantis, Witchbrook, Attack on Titan 3, 4: LOOP, Rayman Origins Enhanced Edition, Horizon Hunters Gathering, Clive Barker's Hellraiser: Revival, Minecraft Dungeons 2, PGA Tour 2K27, Valor Mortis, Star Wars Galactic Racers, Game of Thrones: War for Westeros, Planet Zoo 2, Gears of War: E-Day, EA Sports FC 27 and Control: Resonant.
Several unannounced games leaked on Steam were also flagged only by AppID or placeholder names, including an unannounced Nickelodeon game, an unannounced Telltale Walking Dead Collection, an unannounced Twin Peaks game, an unannounced Dune game (possibly tied to Dune: Awakening's single-player component), an unannounced Shrek game, an unannounced Warhammer game, plus oddities like Custom Hobo, Road Kings, HoloTrials: Case Covered, Warrior Cats: Clans of the Forest, We Were Here Tomorrow and others. The Steam API leak September 2026 also surfaced listings for a Brawl Stars spin-off, an ALF game and Squadron 42, which suggests Star Citizen may be heading to Steam.
Treat this as a snapshot, not a release calendar. Some entries like Judas and Kingdom Hearts IV were already known to be in development, while others have never been officially announced. Achievement presence confirms a Steam AppID exists and achievements were staged, not that a launch is imminent.
Persona 6 Achievements Leak: Story Spoilers and Setting Details
The Persona 6 story spoilers achievements are the most sensitive part of the leak, so consider this your warning before you go looking. According to GamingNews24's breakdown of the leaked list, the achievements reveal the new vigilante group is called Hex, formed by signing a contract, with a stronger law-enforcement and investigation theme than Persona 5's Phantom Thieves.
Key details pulled from the achievement names and descriptions: the game is set in Yokohama, a coastal city described as more laid-back than Tokyo, and players will work a police "beat" while arresting perpetrators across dungeons. Dungeon names listed include Justiceopolis, Reverie Dreamland, Hellrite Stage, Craveheart Tower, Yama's Ledger and Enlightenment Factory. Players also apprehend "Wanted Shadows" for a character named Wilhelmina.
Other Persona 6 achievements leak clues point to core systems returning with a twist. Social Links appear to be rebranded as Connections, with an achievement for forming 80 connections hinting at a much larger cast than previous games. An achievement called "Following the Thread" suggests investigation meetings where you connect clues to solve cases, reinforcing the detective angle. Atlus has only confirmed platforms and general direction for Persona 6 so far, so all of this is subject to change, but the achievement text is unusually specific.
Persona 4 Revival also appeared with achievements, which is less surprising - that remake is already confirmed for February 2027 and deep in development. Its leak mostly confirms Steam achievements exist, not new story.
What This Means for Kingdom Hearts IV, Ace Combat 8 and Other Unannounced Games
For players, the practical impact is twofold: confirmation and spoilers. Kingdom Hearts IV achievements surfacing is the first solid Steam-side evidence of the Square Enix sequel's PC version, while Ace Combat 8: Wings of Theve and Dragon Ball Xenoverse 3 moving to Steam achievement staging suggests announcements may be closer than expected. The same goes for Tomb Raider: Legacy of Atlantis, Deus Ex Remastered and Thief: The Dark Project Remastered - all remasters that had not been officially dated for PC.
For developers and publishers, the Steam achievement leak 2026 is a reminder of how much the Steam backend can reveal. Like the Epic Games Store leak in 2024 that correctly outed many future titles, achievement names often contain bosses, endings and mechanics. Even placeholder achievements for the Twin Peaks and Nickelodeon projects could tip off competitors and force earlier reveals.
If you are trying to stay clean, mute keywords like Persona 6 achievements, Exophase and Steam achievement leak on social, and do not click direct Exophase links - many lists contain unmarked story spoilers in plain text. If you are tracking wishlists, expect some of these AppIDs to be pulled private again once Valve fixes the API visibility, which may make the lists disappear from Exophase until official announcements.
Key Takeaways: Steam Achievement Leak 2026
- Exophase scraped Steam's API after private achievements became temporarily public, likely due to a Valve configuration error - not a hack of user data.
- Dozens of games were exposed, including Persona 6, Kingdom Hearts IV, Ace Combat 8: Wings of Theve, Persona 4 Revival, Control Resonant, Judas and many unannounced games leaked on Steam.
- Persona 6 achievements leak points to a Yokohama setting, vigilante group Hex, investigation mechanics, 80 Connections and dungeons like Justiceopolis and Yama's Ledger - heavy spoiler warning.
- Lists are real but not final. Achievements can change before launch, and Valve has not yet commented on the Steam API leak September 2026.
Written by
Devon Yates
Launcher & Platforms
Devon follows the platform wars: stores, subscriptions and the battle for your launch screen. He writes the weekly news roundup.
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