Trialpears has just submitted some Game Info for
Cities: Skylines Achievements.
Trialpears said:A bunch of achievements in dlc packs are actually from patches and are available for all users without buying dlc. The miscategorization is problematic for all of us who care way too much about completion percentage.
Does My Bum Look Big In This?, Singing In The-, and Foggy Weather are from Patch 1.3.0.
Greenest City and Green Energy are from Patch 1.9.0.
It's Called Steve, Nomen Est Omen, Reporting! and Centurion are from Patch 1.7.0
The information here is largely based on
https://skylines.paradoxwikis.com/Achievements and
https://skylines.paradoxwikis.com/Patches. I've also attained all these achievements without any dlc confirming that they should be moved.