Playing from Archives doesn't work, playing from Master Archives doesn't work, reloading a game from my runthrough doesn't work, even restarting and playing a new game from scratch doesn't work. All other Kerrigan Archives was attainable through the archives, so it's pretty weird.
Anyone having similar problems? Or know something about it? As an achivement hunter, this is quite annoying.
edit: Nevermind, found out it had to be done in a single mission. I wasn't aware of that, since it doesn't mention it. If someone could remove this thread it would be nice. x]