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

  Amateur Paintballer (150 points): Finish the Career on Amateur difficulty 
  level. 
  Semi-Pro Paintballer (150 points): Finish the Career on Semi-Pro difficulty 
  level. 
  Pro Paintballer (200 points): Finish the Career on Pro difficulty level. 
  World Tour (80 points): Play a game of paintball in all the Career and 
  Woodsball locations. 
  Training Buff (30 points): Complete all training stages. 
  Communication Skill Proficency (50 points): Max out the main character's 
  Communication Skill. 
  Handling Skill Proficency (40 points): Max out the main character's Marker 
  Skill. 
  Reload Skill Proficency (40 points): Max out the main character's Reload 
  Skill. 
  Speed Skill Proficency (40 points): Max out the main character's Speed Skill. 
  Accuracy Skill Proficency (40 points): Max out the main character's Accuracy 
  Skill. 
  Woodsball Chief (50 points): Win at least 50 Woodsball Ranked Matches over 
  Xbox LIVE. 
  Speedball Chief (50 points): Win at least 50 Speedball Ranked Matches over 
  Xbox LIVE. 
  Predator (80 points): Make at least 200 eliminations in multiplayer matches.