Garry's Mod achievements problem

I recently played over a week of GMod, and found it weird that I didn’t get the achievement for it. In fact, I didn’t get achievements for a lot of things. Ingame, it seems the achievements that track with a progress bar don’t seem to change(i.e. Startup Millenium, Addict, Creator).

I was wondering if this happened to anyone else and/or if anyone has a fix for this. It would be greatly appreciated!

Happened to me as well, I never and still haven’t gotten the week achievement even after playing 400 hours