Vehicle Efficiency: Destroy six vehicles in any fashion. 
Jeep Efficiency: Get four kills with a car. 
Tank Efficiency: Get four kills with a tank. 
Plane Efficiency: Get five kills with a fighter plane. 
Boat Efficiency: Get two kills with a landing craft. 
HMG Efficiency: Get four kills with a heavy machine gun. 
Air Defense Efficiency: Kill two planes with an anti aircraft gun. 
Bombing Efficiency: Kill four enemies with air raids.