Hey folks. Sent in a ticket and was basically given the “not our problem” so wanted to see if anyone else had had this issue. On the last part of Free For All, More For Me (Legion PVP WQ Achievement) doing Darkbrul Arena when it pops, but the other day at 16/20 I did number 17, tracker ticked up, went about my business… then later in the day noticed the tracker was back down to 16. Thought I imagined it. Then it happened again yesterday. Up to 17, later back down to 16. I’m stuck at 16. My automatic reply said that GMs can’t do anything about it, so am I stuck with an uncompletable achievement?
Edit: gotta love that somehow I posted this under a character I haven’t played in over three years… can you tell I’ve never used the forums? I’m totally a lost cause here lol
Having same issue had 19 then 18, twice now.
How recently did this happen to you? Would you say it’s fairly recently?
Thursday 11/19/20 I should have had 20/20 for off the top rock, Today 11/21/20 i logged in at 18/20 and did 1 for 19/20 at 9am. it says 18/20 and I have a screenshot of it @ 19/20. Off the top rock is the one I am referring to so I am assuming they are all broken at the moment.
That also coincides with when I began having issues, I believe it was also Thursday for me. I’m going to submit a bug report and continue trying the WQ as it pops. Good luck man we’ll get it eventually 
I am having the same problem, stuck on 9/20 and i did it at least five times more already. I will open a ticket, but you know… they send you to check forums… well, alright! im previously checking, sir! Theres more cases and sadly not a solution yet.
Can confirm, having the same problem with The Darkbrul-oh. Cannot believe this issue actually exists, how could completing a quest DECREMENT an achievement tracker instead of increment!? Absolutely asinine.
Has anyone figured out what to do about this yet? I have been completing the WQs all week and didn’t notice it was doing this until last night. I’m
Some folks in the bug report thread are saying this might be fixed now, but I’m doubtful. I’m pausing work on this achievement until I’m sure that it’s been fixed.