This solution was auto hidden.
I dont know if it's glitched or what... but what I did was very simple and I got it very quickly.
But first, I just want to say that it says do this in a single match, but my achievement tracker was sitting at 92% before I got this. You would think that I was 92% almost there, and then you start again and it will update if you pass 92% the next try. But how I got it was weird. I was sitting here and the xbox dashboard was cycling through showing me achievements that I dont have yet as its screensaver thing, and I noticed that the achievement has a gun part as it's image. So I thought, lets see if that's a real gun part and equip it and see if I can get the achievement with THAT gun. Then BOOM. 10 seconds into the match I got it. I rushed the first group of fighters at the center. I didn't even kill anyone. I just lit a bunch of them up and then it popped. SO I don't know if that previous 92% counted. In the previous matches I did attack capital ships a lot. But in the match that it gave me the achievement, there were no capital ships to even shoot yet.
The weapon I equipped in co op fleet was czerka burst cannon (3rd one) with the X wing.