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

  The Spark (20 points): Win a game. 
  Life Preserver (10 points): Increase your life total to 30 or more in single 
  player, or 60 or more in Two-Headed Giant. 
  Magic: The Puzzling (10 points): Complete a challenge. 
  Devastator (10 points): Deal 20 combat damage to a player in a single turn in 
  a game. 
  Defender of Foriys (20 points): Win a Two-Headed Giant game. 
  Spellslinger (0 points): Defeat someone who has earned the Spellslinger 
  achievement. 
  Duelist (10 points): Win 5 ranked Xbox Live matches. 
  Epic Conclusion (40 points): Defeat Tezzeret in the final single-player 
  campaign battle. 
  Puzzling Master (20 points): Complete all challenges. 
  Master of Artifice (10 points): Defeat Tezzeret & Tezzeret in the cooperative 
  campaign. 
  Duels Master (20 points): Win 10 Xbox Live matches. 
  Planeswalker (30 points): Unlock 100%.