Complete the following tasks to unlock get the allotted GamerScore.

1 Secret Mission Cleared - GamerScore 20:
Clear 1 secret mission.

2 Secret Missions Cleared - GamerScore 20:
Clear 2 secret missions.

2 Secret Missions Cleared - GamerScore 30:
Clear 3 secret missions.

4 Secret Missions Cleared - GamerScore 40:
Clear 4 secret missions.

5 Secret Missions Cleared - GamerScore 50:
Clear 5 secret missions.

Mission 5 Cleared - GamerScore 20:
Clear up to mission 5.

Mission 10 Cleared - GamerScore 20:
Clear up to mission 10.

Mission 20 Cleared - GamerScore 30:
Clear up to mission 20.

Mission 30 Cleared - GamerScore 30:
Clear up to mission 30.

Mission 40 Cleared - GamerScore 40:
Clear up to mission 40.

Mission 50 Cleared - GamerScore 50:
Clear up to mission 50.

Cleared Story - GamerScore 50:
Clear the story.