Winning on permadeath+Rogue does not grants the easier achieves. I don't have any interest in playing on elvish or dwarven modes. The achieves look like they're a lot easier to get without permadeath. As a rogue+permadeath player, i'd love to see them all available only in that mode, but I know that a lot of players would disagree with that. I'm torn between being an overachiever and playing the game the way I want to.
