This achievement will come through your campaign play through.
The easiest way to unlock this if you want to boost this is on the 5th level. You need to destroy 8 landing craft to continue. So that you can just reload checkpoint, destroy 7 of the landing craft. Once you have die, the checkpoint is at the start of the objective where you need to destroy the landing craft.
(The game glitches on me at this point and would not allow me to continue as 2 landing craft were invincible. To sort this problem out delete the cache of the console and restart the game. This sorted it for me)