A new beta release for the Steam client includes scoped-achievements.
Achievements can now be split into game mode specific, DLC specific and seasonal specific achievements.
In theory, this will now allow players to achieve achievement completion, even though they’re not interested in the multiplayer aspect of a game.
As of now, the only game in my library that supports it is Euro Truck Simulator 2. The Witcher 3 (even with the new remastered update) doesn’t have this feature and also doesn’t categorize it into DLC-specific achievements for example.
ooh ets2 is the game I immediately thought of when I saw this! this might motivate me to finally try to get more achievements in it