Basically I lost all my achievements
I just logged in today and saw a notification about getting an achievement (though I already had that achievement) so I looked at my achievements showcase and found most of my achievements gone. It looked like all my achievements were reset. I got some achievements back (namely Big Fish and Back In My Day) but achievements like Princeps Civitatis and Starvation Mode were lost and I have to redo the requirements for those achievements to get them back.
So in conclusion, RIP my displayed achievements
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same thing earlier
Same
I got the same