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.
Other side of the coin: the change to the completionist showcase, and just all of it as well I guess, is finally giving me the onus to break my cheevo addiction and go back to gaming for the sake of gaming.