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

  L.A. 2016 (80 points): Complete Chapter 1 - L.A. 2016 on any difficulty. 
  Thank Heaven (80 points): Complete Chapter 2 - Thank Heaven on any difficulty. 
  New Acquaintances (80 points): Complete Chapter 3 - New Acquaintances on any 
  difficulty. 
  The Sights (80 points): Complete Chapter 4 - The Sights on any difficulty. 
  Underground (80 points): Complete Chapter 5 - Underground on any difficulty. 
  Into the Wild (80 points): Complete Chapter 6 - Into the Wild on any 
  difficulty. 
  Angie (80 points): Complete Chapter 7 - Angie on any difficulty. 
  Every life is sacred (80 points): Complete Chapter 8 - Every life is sacred on 
  any difficulty. 
  For the Resistance (80 points): Complete Chapter 9 - For the Resistance on any 
  difficulty. 
  Seasoned Commander (100 points): Complete the Game - Become a commander on 
  Medium difficulty. 
  Veteran Commander (180 points): Complete the Game - Become a commander on Hard 
  difficulty.