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 done it on a different character, and I guess you must complete them all on a single character to get the achievement.
It's definitely not all on a single character, b/c what's green here was done by another char - she's just level 20 so far. Gues that's not it... :/ Seems to be the faction thing - it has to be done all on one side of the game o.O