The main problem is that on some battlegroups (such as mine -- EU Blackout), the population imbalance simply makes getting many of the achievements (or even winning at all) near-impossible, thanks to vastly fewer players bothering with AV after the marks were no longer needed for gear. http://bit.ly/hLUPpk

I feel your pain. I'm on EU blackout too and horde never has a chance to win making a lot of the achievements impossible. The
http://bit.ly/hIfm2M

Kemikalkadet and Helloimbob: Yep, things are curiously biased towards Horde in 50-60 AV, but while it used to be the case that we still put up a half-assed attempt in 60+, these days it just seems like they're all giving up entirely and there literally aren't enough players to compete.
http://bit.ly/e7ClhH

DaPwner: We do -- that's what Blackout is, it's a battlegroup that contains my server (Azjol-Nerub) and several others. The problem being that amongst all the servers in the Blackout group, the Horde just don't seem to want to bother with 60+ AV anymore. :(
http://bit.ly/ihyoDc