Accomplish the below tasks to get Gamerscore points:
Mad Cat Skillz: Get nine lives.
Multitastic: Get a 10x multiplier.
Pacifism: Survive the first sixty seconds without shooting or using a bomb.
Quartermaster: Collect nine bombs.
Score 100,000: Get 100,000 points.
Score 250,000: Get 250,000 points.
Score 500,000: Get 500,000 points.
Score 1,000,000: Get 1,000,000 points.
Survive 100,000: Get 100,000 points without losing a life.
Survive 250,000: Get 250,000 points without losing a life.
Survive 500,000: Get 500,000 points without losing a life.
Survive 1,000,000: Get 1,000,000 points without losing a life.