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

  Tank Commander (25 points): Attain the rank of Tank Commander. 
  Hard Shot (5 points): Shoot an enemy using full power. 
  Revenge (15 points): Eliminate your killer with your last dying shot and get 
  revenge! 
  Cleanup (5 points): Kill 2 enemy tanks with one nuke. "A nuke on the 
  battlefield is worth two in the store." 
  The Vice (20 points): Kill an enemy while flying upside down. 
  The Dex (20 points): One shot an enemy tank using a straight up MIRV. 
  Deadeye (15 points): Hit and kill an enemy with 3 shells in a row. Each shell 
  must be airborne for at least 1 second. 
  Missile Master (25 points): Hit an enemy with 3 missiles in a row. Each 
  missile must spend at least 2 seconds in the air. 
  Jump (15 points): Fly half the width of the screen and stick the landing... In 
  under 5 seconds. 
  Veteran (10 points): Rack up 50 on the Total Kills leaderboard. 
  Elite (20 points): Rack up 250 on the Total Kills leaderboard. 
  Maniac (25 points): Rack up 5000 on the Total Kills leaderboard.