Can someone explain this to me? It shows it was completed some yrs ago but doesn't count?! Others too...
#Warcraftpic.twitter.com/dXUxOjK1jJ
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You have completed the meta achiev in another character, probably.
But it's an account-wide achievement, that Loremaster. Doesn't seem to mean that you can do it on both factions. Just on one - looked it up. The grey ones were done by Alliance chars and this is a screenie from Horde...