Achievements locked?

[omega13ful]

I was doing a city to get some of the achievements and when I loaded up the save achievements were no longer allowed on it. I haven't loaded any mods load in it yet so I don't see why it would randomly disallow them.

 

[SgtOCC1324]

I am also having this issue. Unmodded city (no workshop items even subscribed to), after reaching the 2nd population milestone the achievements are locked. Starting a new city also results in this.