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
English
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the last one, do the archive mission on venus
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Thank ^^