The only achievements I really respect are Battlemaster, Arena Master, and certain Heroic Raid mode ones. Hand of Adal, Naaru, all of those were a joke to get not too long after they were implemented. The Exalted and Insane too, though they're both just a lot of farming (a lot of farming I don't want to do. . . even though I'm really close the The Exalted).
---------- Post added 2011-01-08 at 01:44 PM ----------
I agree with Herald of the Titans too, it wasn't easy when I attempted it mid ToC times.