For one of the five knot, that of heavy weapons. I just tried to dismantle a legendary machine gun and that gave me an item related to the quest. After you just have to validate the item in the item Icélo! I think that for the other three must perform Warsat on the Earth, Moon and Mars. The last by cons, no idea! Edit : For Proof (Sorry for quality and French Version) http://www.hostingpics.net/viewer.php?id=944108uUUijCT6DSZV7THxbhktynDnVQHHRdyE7GTlKCaFSM.jpg