Divine Winds of Leyte is the 9th mission in the American Campaign. You will have an Atlanta class cruiser, which has an extremely powerful anti-air battery. You can beef it up even further by activating the autoloader Naval Supply. Ignore anything in the air except for kamikazes and Betties. Use the tactical map to quickly identify planes before they are really in visual range so that you know where to focus your gunfire. Once you switch from controlling the cruiser to a squad of Helldivers, the achievement will unlock. This is easier to unlock on Easy since the kamikazes are basically one shot kills at that point, but it is not particularly harder on Veteran.