I don't know if the quests have been fixed yet, but as a person, who got the "Loremaster of Northrend" achievement two months ago, I can safely say that no quest from the other zones leads back to Howling Fjord. This because the Fjord is considered to be a "starter leveling" zone for fresh 68-ers. I have forgotten the details, but I think HF opens a connection to the Grizzly Hills (the same way Borean Tundra leads players to Dragonblight).
I don't know if the quests have been fixed yet, but as a person, who got the "Loremaster of Northrend" achievement two months ago, I can safely say that no quest from the other zones leads back to Howling Fjord. This because the Fjord is considered to be a "starter leveling" zone for fresh 68-ers. I have forgotten the details, but I think HF opens a connection to the Grizzly Hills (the same way Borean Tundra leads players to Dragonblight).
there may not be, it's been a long *** time since i did loremaster. i just remembered some quests leading back to other zones and figured it was worth checking.