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

  Complete The Game (25 points): Finish the game. 
  Often Say Die (25 points): Play through 20 player deaths, with difficulty set 
  to Hardest. 
  Points III (25 points): Score 300,000 points. 
  Perfect Challenge (25 points): Complete a perfect bonus round. 
  Chopper Stopper (15 points): Defeat the Black Turtle helicopter in Mission 
  2... with difficulty on Hardest. 
  Points II (15 points): Score 80,000 points. 
  What's a Ninja? (15 points): Complete Mission 1 without losing a life. 
  Negotiator (15 points): Rescue 25 hostages. 
  Kick It (10 points): Use Melee. 
  Points I (10 points): Score 20,000 points. 
  It's Electric (10 points): Use Lightning Magic. 
  Killer Winds (10 points): Use Tornado Magic.