Accomplish the indicated achievement to get the corresponding number of 
Gamerscore points:

  Complete The Game (25 points): Play through the final scene of Gunstar Heroes. 
  Golden Silver (25 points): Defeat superboss Golden Silver. 
  O Brother (25 points): Defeat Green. 
  Greedy Fly (25 points): Defeat Black Fly. 
  Locked and Loaded (15 points): Begin the game with each weapon. 
  Colonel Red (15 points): Rescue Yellow by defeating Smash Daisaku. 
  OMG 11 Bosses (15 points): Complete the Dice Palace and defeat Black Beat 
  Stepper. 
  Not Quite Red (15 points): Defeat Orange on the Flying Battleship. 
  Crab Attack (10 points): Defeat Crab Force in the Underground Mine. 
  Pink (10 points): Defeat Pinky Roader in the Ancient Ruins. 
  Bravoo Man (10 points): Defeat Bravoo Man in the Ancient Ruins. 
  Papaya Dance (10 points): Defeat Papaya Dance in the Ancient Ruins.