Giggles_Manically wrote...
I still need to unlock the evil acheievements but cant see to do it.
Cleansing the tower isn't evil, though I've only done it a few times. Cullen is right that you have no way of knowing if any surviving mages are abominations.
For me, the most challenging from a role-playing perspective were defiling the ashes and siding with Swiftrunner. My only ashes defiler was a city elf - not evil, I would say, but totally an anarchist. She wanted to undermine all the human power structures in Ferelden and would have loved to see the civil war continue if not for the Blight. But she was at least able to leave Ferelden with a weak ruler by double-crossing Anora and sticking an unhardened Alistair on the throne.
My lone slayer was a human racist b******d. He probably would have been a decent enough sort had his family lived but without their influence his dark side emerged, plus he hated the loss of his social and political standing. So he found the Dalish insufferably uppity and figured the werewolves would be stronger allies anyway. He went the whole way - seduced Gheyna, lied about the halla, traded Athras' wife's scarf to the Hermit and killed the Grand Oak. He also sided with Harrowmount so that Orzammar would be weaker in the long run. He did side with Caridin but only because the dwarves might get too powerful if they had more golems.