From late 2005 to ... 2018. Thirteen years it took me, but I did it. Master of Warsong Gulch + Master of Alterac Valley + Master of Eye of the Storm + Master of Arathi Basin = Battlemaster Title.
No mounts, no pets, nothing, except a freaking AWESOME title. There is 1 Battlemaster for every 10.000 players or so. It cannot be bought with gold of USD. You cannot be boosted. It takes time. skill. perseverance. You cannot be carried for it, not like "The Chosen".
All in all, a great achievement, may be my best achievement. And it's done.