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