I, too, am having this same issue. I also opened a ticket and got the same response from a GM that they are aware of this issue, but there is no current fix. It was suggested that I comment here so that Devs would be aware and a fix might be found. I think it’s possible that the pre-patch content is the cause.
My wife has completed the “Into the Archives” meta-achievement and the “Azure Spanner” achievement, so I know it can be done; but she did it many weeks before me [June 25, 2024 - Void Elf Hunter]. I, too, am trying to complete the “Azure Spanner” achievement so that I may attain the “Dragon Isles Pathfinder” achievement. According to my BtW Quests Addon, I have successfully completed all of the quests in the chain, so my best guess is that it’s just bugged at the moment.
I am also having an issue withdrawing gold from my guild bank, and I have read that a lot of other players are having the same issue… so, it’s safe to assume that this is all connected. I’m guessing that when they started to implement the cross-realm, cross-faction, and warband stuff, it set the global architecture on fire, if you will. I have a feeling that Devs will have a field day trying to make everything that is being reported work as it used to, or as it should. I suppose it is also possible that some fixes may never happen – seeing as that has happened in the past. It all depends on the demand to fix it.
Anyway, I’ll keep following this here and hoping for the outcome we all want. Cheers, fellow Azerothians, and good luck! 