This trophy isn't all that hard as long as you try it after you complete the game. Once you reach level 48, you'll have completely upgraded everything, including the power of your weapons on foot.
Head to the Credits section in the Flight Computer. When it starts, go to the right side of the room, just far enough that the words won't bump into you on the way by. From here, simply shoot up and left.
You can adjust your aim or you footing if you like, but this should help you through the credits just fine. You don't even need to grab the power ups to complete it this way.