Hello, SOrry can't help you cause my eyes is like -- > Ó_ò

Though, My IRL friend completed that "Back from the woods" and I see on lodestone he got the achievement also and he can still quest it seems.
Did you try go to Uldah and look? , or even Highbridge? (should only be 3 quests or so visible).

Tried to leave walking sands , (to the city outside) and go back in?

You said you waited 3 days and if it was a bug or something then it should happen to everyone.. hmm