Had this same problem back in April (2018) and had a few problems. This is my ticket, as first submitted:
The achievement is not showing that I have received “Blast Furnace”, which I completed in the basic quest line for the shipyard. I have a “Blast Furnace” upgrade in my backpack now as proof of completion.
This was my follow-up because I attended Derek Zoolander’s school:
The name of the achievement is “Naval Mechanics”. I believe I incorrectly entered “Naval Equipment” when the ticket was opened.
This was the GM response:
Llirdray
Hello there [my name]!
I am Game Master Llirdray, at your service. Hope you’re doing really well! Thanks so much about being so patient with the wait time on your ticket, by the way. We recently had a ton of tickets come in and are working very hard to get the wait times down as quickly as possible. In the meantime, since you put in lots of information about what happened in your ticket, I was still able to investigate.
Thank you very much for bringing this issue with that achievement to our attention! I know just how annoying something like that can be, especially when it can hold up your progress. It looks like we have reports of this from other players, so I’ve added your report to the list to assist our Quality Assurance team in investigating the matter further. Luckily, I could verify you had all the requirements on our end, so I granted you credit for that achievement!
I also wanted to let you know that we have a really nifty “Submit Bug” feature! This feature will send your feedback instantly and directly to our quality assurance team for review. I highly encourage you to use this button to report this issue to our QA department. To use it, simply open the help panel as though you were going to submit a support ticket, then click on “Submit Bug.”
I also encourage you to check out our Bug Report forum [link not available] to discuss this issue with other players, as well as fansites like Wowhead and Wowpedia for more information. d(^-^)z
If you have any other questions, or need anything else, just let us know. Thanks again for reaching out to us.
Sadly, there were a “few” problems with how they responded. First, I had purchased but had not turned yet turned in the quest item for the final piece of equipment (one of the reputation required items purchased from the vendors in Vol’mar/Lion’s Watch). Because what they did was simply “grant” me the achievement, the next time I logged in the quest item was gone and the quest was removed from my log. I lost the reward from the quest, the quest count towards all those “do more quests” achievements, and I was unable to get a screenshot of the actual achievement on completion (which again - if you have problems with Blizzard, document EVERYTHING!).
Yes, I got the achievement. But was dumbfounded as to why a simple request to get ONE part of a bugged achievement corrected could be so poorly mishandled. Be very careful about what you ask for when submitting a ticket.