Did something similar ever happen before with achievements where they got reset and if so, how long did it take Blizzard to fix them / did they fix them?
I am pretty worried i will have to start over on some of them that took waaaay long to grind out or if some of them will stay broken forever.
The same thing happended a few patches back and they did get fixed, some quicker than others. But i think all were fixed within a few weeks or so.
How long it will take this time though, nobody can say. May not be the same issue causing it or the same fix needed, plus they have so many other issues to deal with just now. All we can do is wait and hope it won’t be too long.
There was a blue post about the issues with achievements you can find it here