Jerykk wrote on Dec 5, 2012, 00:01: It would be nice if the Shadow achievement was retroactive. I was spotted once on the very first mission but didn't notice, then played through most of the game before I checked my stats for that mission. I replayed the level without getting noticed but apparently the achievement is based only on the save you completed the game with.
I agree. Given that the game is broken up into chapters it would make sense to recognise them individually, as otherwise it seems a bit pointless to allow you to replay a chapter. Then again, considering non-lethal kills can so easily turn into lethal kills (a body sliding down into water; rats randomly devouring unconscious enemies) the achievements are a bit niche and are really only for OCD-types. I think the game could have done more to reward stealth.