and it's an ugly situation for Valve

• Steam achievements of upcoming and unannounced games have leaked
• The achievements include spoilers for games like Control Resonant, Kingdom Hearts, and Persona 6
• Valve hasn't commented on the achievements or recent prototype leak on Steam

Steam achievements for both upcoming and unannounced games may have been leaked by Valve and spotted on the third-party site Exophase.

As reported by PC Gamer, the leak includes nearly 90 games, including Control Resonant, Kingdom Hearts 4, Gears of War E-Day, Tomb Raider: Legacy of Atlantis, and Persona 6.

The leaked achievements are listed for each title on Exophase, including spoilers for major plot points, character reveals, and even weapon unlocks (notably for Kingdom Hearts 4), despite missing full descriptions. It's effectively created a minefield of spoilers to avoid, which is made worse since the list includes games that don't even have a release date.

It's not exactly clear how this leak occurred on Valve's end, but it doesn't appear to be a breach of the Steam platform. Instead, it may very well be an issue with Valve's API exposure, at least according to Exophase owner Mike Bendel, who claims it's a "possible screw-up on Valve's end", which makes this the second slip-up in just a few weeks.

Recently, around 12TB to 13TB of early prototypes, unreleased titles, and scrapped builds of games between 2003 and 2013 were leaked from Steam, including games such as GTA 5, The Binding of Isaac, and even some of Valve's very own games like Left 4 Dead.

It's possibly the worst spell of game leaks for publishers launching games on PC platforms like Steam, especially with the leak of builds for games like Death Stranding 2: On the Beach and Forza Horizon 6 before launch.

There's clearly a major security issue at hand with Steam, and until it's addressed, game leaks seem inevitable. Game achievements, while potentially spoiler-filled, are minor in comparison to the very recent game prototype leak.

Valve hasn't made an official statement on the Steam prototype or achievements leaks, but with its impact on both publishers and consumers, it wouldn't be surprising to see both cases addressed soon.