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.
I don’t know how it could be, because AFAIK this data point is exactly what’s missing. The only heuristic would be “was achievement XYZ added before or after DLC ABC released?”, but that’s gonna be inaccurate in tons of cases.