Well, I didn't, but looking at the xp from normal, on paper it seems possible. I doubt anyone ever played the game on easy, though... I would, if there was a "quick battle" button (since the enemy strength is greatly reduced), otherwise it's just not worth the waste of time. If anyone's willing to do all quests, kill absolutely all enemies on the map, get absolutely all treasures and such... he can feel free to try. Oh, and get the learning upgrade at char lvl 1 because of the extra runes
I may be wrong though. I'm not dismissing that possibility at all, don't get me wrong