After writing my own issue, I saw this. I have the same problem. Never played with mods or cheats. After reloading my last save, I got the same message "Achievements are disabled". No reasons were mentioned. So why?
I spend a lot of time to build my character and clan. How can I fix this? Because I dont want to play my character after achievements are disabled. After all I wanted to get some of the achievements.
And I was about to create my kingdom after 1600 ingame days...
I feel you R.Akkantor. I hope that it can be fixed.