So I decided to play though Dishonored again to try and get the achievement Clean Hands for not killing anyone. So I know there is a problem with the final Granny Rags mission where she counts as a hidden death even if she was just knocked out. Well one of my friends got the achievement by simply pickpocketing Granny Rags, getting the key, and leaving. So I tried this, and after the final mission I checked all my stats and had no deaths, and did NOT get Cleans Hands. Just curios is this is explainable.