As a big fan of the Dark Brotherhood in The Elder Scrolls V: Skyrim, getting this achievement was an awesome moment. It's the final mission you'll complete for the Night Mother, as you slay the Emporer himself. Getting to that point takes some time, though. Let this great video show you the best way to do the deed.
Complete the assassination to get 30G on Xbox 360, or a silver trophy on PlayStation 3. PC players, let's rally together to get something besides bragging rights for our achievements!