I remember an thread about this over half a year ago. Basicaly my question is if I will be able to get it on other characters aswell or only on the one I was logged in when receiving the meta achievment. After I've took the battleground from the blacklist I did the last 12 missing victories on my main today. Problem is that the Alliance NEVER EVER has the workshop and thus I can't actually destroy the siege engine (getting the killing blow that is...).
Seeing how the killing blow on the siege engine is what is going to net me the meta I am a bit worried, sure the tabard looks far better on an Alliance char than Horde but I'd still like to have it on my main and not just my Alliance alt.
The problem here is that the battleground Metas are "BLUE ACHIEVMENTS" and thus only obtainable once! so doing it again simply isn't possible. The same way you can get pet bettle achievments only once.