Loremaster of Outland is currently impossible.

The Shadowmoon Quest "Of Thistleheads and Eggs..." has been bugged for a while now, according to other players I asked if they were able to do it. The eggs will always throw up an error of "That item is already being used." Which makes it impossible to clear the quest, so you can't finish Shadowmoon for the Loremaster of Outland achievement.