Warcrafting: Loremaster Lariko
Yes, the tabard given for this achievement has a big yellow exclamation mark, just like what the game puts over the heads of quest givers. I like it. :)
I rather don't expect to be earning this for another character for a good long while, if ever. But I'm really happy to have done it once, and happy to have finally done all those Icecrown quests before the Lich King gives way to Deathwing as public enemy #1.