Accomplish the indicated achievement to get Gamerscore points:

Adventure Story Complete: Successfully complete Adventure Story mode
Eight-Port Master: Earn a gold medal in The Eight-Port Challenge scenario
Friend Of Wally: Built a habitat for Wally
Marksman: Successfully complete War Story mode Mission 4 (Into The Warp)
Max Power: Get Max Power to help in War Story mode Mission 6 (The Attack)
Sir Protector From Asteroids: Successfully complete the Hammer Scenario
Survivor: Earn a gold medal in the Survival scenario
War Story Complete: Successfully complete the War Story
War Story Gold: Successfully complete the War Story with all gold medals