LIFE ON TITAN
Well for a while there I thought that it was impossible, but since I never back down from a challenge I persisted. First of when you shoot down the Laz-research vehicle others come to pick up the unknown origin and since you can't pick it up yet you have to keep it in a safe place that they can't pick it up from, a tunnel.
Next problem I found was if you shoot down the Klamp-g research vehicle in a tunnel (decoy required mission) then the plot stops. The solution was to shoot him until he drops the unknown origin and then to let him live, he continues on to the Klamp-g hq and the plot continues.
So now you have six unknown origin waiting to be picked up in the tunnels, at this stage I was feeling pretty confident. I kept going on with the plot, got a fusion cell and all the time giving downtown munitions what ever they wanted. They made a couple of nukes and big bob missiles, I loaded them up and did a collection run of all the unknown origin. Took it to trade central and tried to sell it, another problem, they pay 99,999 for each one that's a million all up. Well of cause they didn't have enough money to buy them all. So I started a long and boring idea to get the money to trade central, I would buy things of them and then sell them back for less than I paid.
My hat goes of to ashlocke for this challenge, it took me about 20 hours to finally get it, but it sure was satisfying.