There is a workaround to unlock this glitched achievement thanks to the developer for adding in this workaround in-game cheat code which unlocks this achievement "Army of one" as well as the "Collect'em All" achievement! Also thanks to Shadow Kisuragi for having me test this and giving me the heads up on it as well as YouTuber "Xbox 360 Collector" who recorded a video of this on PS4 unlocking the same trophy. Here's how to unlock this achievement and the Collect'em All achievement:
To unlock the achievements, start or continue a game and settings don't matter. Just go to Hangar, choose any ship and press start. Once you are in the level and able to move around press the following code (you don't have to be fast with it either):
Up, Down, Left, Right, LB, RB, B
If done correctly you will see an in-game notification say something about all items being unlocked and then both achievements should unlock! They first showed up on my Xbox App on PC but shortly after popped up on my Xbox but for me there was a slight delay.
I also recorded a video of me unlocking these achievements which I will be uploading soon.