One Faulty Steam Backend Endpoint Stripped Bare Hundreds of Games: Persona 6's 48 Achievements Even Spell Out the Ending
Late on the night of September 8, achievement-tracking site Exophase's backend began receiving abnormal data. A batch of "games" with no names — only Steam App IDs — started spitting out achievement lists. The site's automated crawler took them all in. The next morning, site owner Mike Bendel posted a single line on ResetEra: "Looks like something went wrong on Valve's end. A bunch of achievements that were supposed to be private became directly accessible via the API, so they got scraped into the site." 1. The Night the Switch Failed Steam's achievement system has a design premise: developers upload achievement data to the backend in advance — sometimes a year to a year and a half early — so achievements can unlock properly on launch day. By default, this data is invisible to the public until the store page goes live. On the night of September 8, that switch failed. The result was the most awkward "unboxing" in PC gaming history. VGC's phrasing: "hundreds of upcoming games," a large share of which were never officially announced. The data quickly spread to SteamDB, Reddit, and the entire gaming press. 2. Layer One: Persona 6 Taken Apart The biggest bombshell was Persona 6. The achievement list runs 48 entries long. Atlus has released only one trailer to date and hasn't even formally shown the protagonist. Yet those 48 achievements reference the new setting (Yokohama), an organization called "Hex," dungeon structures, the composition of the protagonist's core team, and the Velvet Room attendant — the signature character that appears in every entry of the series. A game with no announced release date had its skeleton hung up on the internet, complete. 3. Layer Two: Kingdom Hearts IV Leaks "Star Wars Worlds" The second hardest-hit title was Kingdom Hearts IV. The list contains 50 achievements, plus 2 hidden entries. Leaked locations include Toy Box (Toy Story), Scala ad Caelum, Quadratum, and a batch of worlds apparently pointing to Star Wars and The Haunted Mansion. The problem: Square Enix has officially confirmed only one world to date — the Coco-themed world. Even Reddit players are using this list to reverse-engineer the Disney world list that had been circulating. The timing is also delicate. Last month, co-director Tai Yasue and series creator Tetsuya Nomura were still assuring players that Kingdom Hearts IV would 100% not slip out of its second-half-2027 release window. Now players know its worlds first. 4. Layer Three: A String of Projects Nobody Has Heard Of What really sends chills isn't these big IPs — it's the projects nobody knew existed. Announced, achievements exposed for the first time: Gears of War: E-Day, Silent Hill: Townfall, Tomb Raider: Legacy of Atlantis, Deus Ex Remake, Minecraft Dungeons 2, Tropico 7, Ace Combat 8, Metro 2039, Lords of the Fallen 2. Unannounced: a The Walking Dead collection (Telltale), a Nickelodeon-licensed Animal Crossing-style life sim, an unrevealed Tetris, a suspected Sea of Thieves spin-off, a Steam port of Professor Layton vs. Phoenix Wright, plus a suspected Shrek 2 remake, a suspected Twin Peaks-themed game, and unannounced new Sonic and Stellaris titles. 5. Why One Endpoint Error Could Make Such Waves Because Steam is the industry's only "main switch." PC game distribution is heavily concentrated on Steam; one platform-level configuration error can hit dozens of publishers simultaneously. And achievement data is the least-defended link in the development pipeline: plaintext, structured, uploaded early, and voluminous. You don't need to breach any company's firewall — you just need Valve to make one mistake. One more number worth placing alongside: this is Valve's second embarrassing leak in two weeks. At the end of last month, a leak made publicly downloadable roughly 13TB of everything uploaded to Steam between 2003 and 2013. 6. A Word of Caution: Don't Treat the Leak as a Release Schedule One thing must be said clearly: an achievement list appearing in the backend does not mean the game will definitely ship. Projects can be canceled after years of development; placeholder entries may never become real games. The projects on this list span everything from "releasing next year" to "quietly shut down three months ago." For players this is premature spoiler; for developers, it's narrative assets depreciating early. Story-driven works like Persona and Kingdom Hearts lose the most directly — achievement names inherently leak plot progression, boss fights, and endings. My Take What truly deserves remembering isn't the thrill of the "biggest leak in history," but this: when the entire PC gaming ecosystem ties its lifeline to one platform, a single switch on that platform gets to decide "when and what" gets announced for dozens of developers. Valve has not officially responded to this day. Did you get spoiled? Should platforms be held accountable for this kind of thing? Come share your thoughts in the [Gghubs](https://www.gghubs.com/en) comments.