I finished the achievement about a month ago now and did not receive the achievement reward. I filed a ticket three weeks ago and I was told “we are working on a fix”. Still nothing and no update. The ticket response told me that while the fix was being worked on, I should just check my rostrum for the reward (as if that is not the first thing I did) and that I should check with wowhead.
Can any update be provided on this? This was the coloration for the Grotto Netherwing Drake that I was most looking forward to, so it sucks that it is still broken.