https://www.youtube.com/watch?v=bEByYqv3284
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there were already a thread: http://forum.warmane.com/showthread....94-Achievement
However for who wanna copy/paste the command:
/run EnableAddOn("Blizzard_AchievementUI")
Also you can fix the problem in this other way, close the game and:
Go into your WoW Directory>WTF>Account>"YourAccountName">"RealmName ">"CharacterName"
here open the AddOns.txt, search the line "Blizzard_AchievementUI" and change "disabled" into "enabled"