I know for a fact that each epic quest completion gives you a title.
Druids get "Naturewalker" for their 1.0 and "Forest Scion" for their 1.5. I've seen a list somewhere of what each class gets, as well.
Also, while we're talking about titles, I saw somebody with "of the Truthbringer" as a surname and I, curiously, looked in mine and saw it there. I put it on, thought it wasn't for me, and took it off. Later, it was gone. Anybody know anything about this title? I heard it was supposed to be max faction with Knights of Truth but that's not it because I've had that maxed ally for ages.