There are reports this achievement is bugged and not completing for some people even when they meet the criteria. I have it completed but it was down when it was a brawl so I don’t remember if any of my other toons completed it in TWW yet.
Post from the PVP BG Forums: "Battleground Blitzest" Achievement
Maybe once it was not a brawl anymore, it became unobtainable? Because I actually have some progress in it for some of the bgs, but now that its testing is over and it became actually rated and not a brawl, I haven’t been able to earn any progress even winning in under 6 minutes. Unfortunate.
So I am looking the Battleground Blitzest I don’t have any progress towards even though I have the Blitzer achievement. Very odd.
Kotmogu seems to be bugged to never give credit.
Silvershard just isn’t possible with the limited time available.
Yea… Kennie and you are both with me on this. We gotta spread these posts to others so we can get more views. Maybe then blizzard will catch on to the bug lol.