Steam's Achievement Sets beta aims to stop new content breaking your completion status Achievement unlocked. Valve is beta testing Steam Achievement Sets, a feature that lets developers group a game's achievements into collections. In an announcement, the company said that games "live longer than ever, continuing to receive updates through new DLC, expansions, and seasons", but that achievements added with new content "can be hard to discover and can accidentally break the completion status of players who have already finished the game". Games that have already added achievement sets are Against the Storm, Age of Wonders 4, American Truck Simulator, Call of Duty: Modern Warfare 4, Crusader Kings 3, Dredge, Euro Truck Simulator 2, Forza Horizon 5, Flock Around, He is Coming, LEGO Batman: Legacy of the Dark Knight, Left 4 Dead 2, Portal 2, PowerWash Simulator, PowerWash Simulator 2, Team Fortress 2, and Victoria 3.
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Eurogamer