Steam now lets developers group achievements into separate collections, distinguishing base game achievements from those tied to DLCs. The goal is to stop new additions from ruining your completion percentage. The feature, called Achievement Sets, is now live in the Steam Client beta.
Developers will need to update their games to create specific collections, each with a defined purpose. Steam says a growing number of games already support the feature. Developers can group single-player and multiplayer achievements or create seasonal sets, such as a Halloween event collection.
On your profile, achievements appear grouped by set, each with a progress bar. You can display a "set complete" trophy once you earn every achievement in a collection. Your progress will still show 100 percent even if the developer adds more achievements to a set later. Steam has two set types: Base Game Achievement Sets appear in blue, while DLC Achievement Sets appear in purple. DLC sets stay hidden from your overall game progress until you own the linked DLC, so your completion rate is not affected.
Steam has also redesigned its achievements page to display sets and progress more clearly. The page lets you compare your progress with up to three friends, including the rare achievements you've earned and the sets you've completed.
Source: Engadget · Summarized by HeadlinesBriefing