Battlemaster seems to be aimed at Battleground play while the Arena achievement is aimed at Arena play. Arena Master even has a title award.

However, the Arena Master achievement is also required for the Battlemaster achievement. I don't think it should be. Battlegrounds and arenas don't generally overlap and I don't think they should in achievements either, especially since you can do all of the battleground achievements (including some incredibly difficult ones, like winning AV without losing a single tower or captain while destroying all Horde towers) but never get at least five of the achievements required for Arena Master because you just don't care about arena ratings.

I'm all for the arena achievements, but I don't think the only title-granting Battleground achievement should force people to do arenas as well. I would suggest removing the Arena Master requirement from the Battlemaster achievement and possibly making another meta-achievement for people who earn both Battlemaster AND Arena Master.

Good suggestion.

Arena Master will be it's own achievement with title. Battlemaster will now only include the Battleground Achievements and will have its own title.

We'd still like to add a World PvP meta-achievement with some type of reward.