X-Morph: Defense

In the USA mission, halfway through wave 4 you will get a notification that there is an unarmored convoy detected, and that you can receive additional resources by “intercepting” it (destroying it). A new portion of the map will open up to the West. Go and place 2 or 3 basic towers along this path and this should be enough to destroy the convoy. If you notice parts of the convoy making it past your towers, add more towers, or use your ship to destroy them. This is very easy, but may be slightly challenging if you’re trying to do this during a hard gold trophy attempt. I recommend getting this on one of your easy playthroughs. You should get the trophy before the end of wave 4.