Talk:Ghost/@comment-71.22.69.51-20121227221116/@comment-70.184.144.92-20130113014817

I don't believe so, it will only lock the achievement if the guards see you (the three bolts form and then turn red) or if they raise the alarm (a warning if you do the first mission non-lethaly after you neutralize the target a guard will patrol the room and raise the alarm if you don't knock him out). However, that's from what I've heard not actual experience so you might want to verify it.