Complete the following achievements to get the allotted Gamerscore.

Formation Buster - Gamerscore 10:
From a single formation shoot down ALL the planes 3 times in one game.

Missile Attack 1 - Gamerscore 10:
Shoot down 10 bombs in 1910.

Bomber Hunter - Gamerscore 15:
Shoot down 4 bomber planes in 1940

Missile Attack 2 - Gamerscore 15:
Shoot down 20 homing missiles in 1970.

Rescue Mission - Gamerscore 15:
Rescue 10 parachuters in one game.

Smooth Operator - Gamerscore 15:
Reach 1940 without losing a life. Reach 1940 - Gamerscore 20:
Complete 1910 ALL the way through to 1940.

Reach 1970 - Gamerscore 15:
Complete 1940 ALL the way through to 1970.

Reach 1982 - Gamerscore 20:
Complete 1970 ALL the way through to 1982.

Reach 2001 - Gamerscore 20:
Complete 1982 ALL the way through to 2001.

Perfection - Gamerscore 20:
Reach 2001 without losing a life.

Complete 2001 - Gamerscore 30:
Complete 2001.