Hey, just heads up, the achievement called The Gang’s All Here
This is needed for the zovaal’s soul eater mount.
Basically when you were nearly done building the constructs and pre-patch hit, it wiped the entire thing so basically you must start over.
Update: Also progress has been reset on Wardrobe makeover which is tied to the mount.
No rush for fixing it. Just pass it along the dev team CS, thanks!
After prepatch the progress of the following achievements is resetted:
-Treasures of The Waking Shores]
-Treasures of The Azure Span
-Treasures of the Ohn’ahran Plains
-Treasures of Thaldraszus
Only the progress of Treasures of the Forbidden Reach is not resetted.
Same with achievments from Shadowlands, specifically Wardrobe Makeover and The Gang’s All Here.
Here are some other achievements that are missing/have reset, progress on court Favor’s, fashion adomination, crypt couture, the party herald, and full discography, as well as warcraft rumble mini have completely reset. I had finished the rumble yesterday, the covenant achivs I was only missing one or two checks while the discography I had made good progress on.
Lost my progress on ‘court favors’ and ‘dredger style’… when I summon my dredger his customization’s are still there.
Gang’s all here completely reset and I completed the final golem today.
Problems with Abominable Lives too.
2 months grinding (:::::
Most of my achievements that were on progress are reset.
HELP! My many achievement progress is also lost and i have used WEEKS or MONTHS to them!
Also my BAGS are ruined, unusable. HOW IS THIS POSSIBLE?
Lost progress of Sojourner of Azure Span, 3 completed quest lines gone.
I ran into the same issue for several of the Little Scales Daycare achievements, including Hey Nanny Nanny (didn’t see this one mentioned here yet).
Not sure if its any value but i lost a lot of partly completed achievements as well, especially
Tetrachromemancer, only had one more color to get 
I lost my dragonflight campaign progress.
I lost my dragonflight campaign progress to
“Tetrachromancer” achievement (the one for Bakar colors) was completely reset for me – possibly other achievements as well, but that’s the one I noticed because I was only missing one color from it (and from my A World Awoken achivement) so… I’m pretty upset and need this fixed please.
I lost progress on the following achievements.
Progress to " All sides of the Story" has been fully reset too. This achievement took multiple weeks… I only needed Tarjin the Blind
Hey,
the issue was already stated on the US forums, but after the update today the Achievment “Full Discography” is now completely wiped out, even though I had everything except 4 tunes on my (so called) main character.
I already logged in to every one of my characters, because some said sometimes the achievments get buggy when not logged in to all characters on the account/warband.
Will this be taken over in a future bugfix? (I really, really hope so)
Best.
So far I noticed the following achievevments losing progress. I guess there are countless more, we just simply can’t track down them all. Hope they have a way to restore it:
The Garrioson Campaign
Explore Ardenweald
Sojourner of Ardenweald
Awaken, Ardenweald
I have a wild guess that most if not all the achievements with uncomplete prgoression are experiencing the same bug.
Same here! And it’s impossible to redo them 'cause some of they’re are bound to unique quests!