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

  Listener (5 points): Found the first Audio Log. 
  Kikowani Station (30 points): Completed Kikowani Station on Normal, Heroic or 
  Legendary. 
  Data Hive (50 points): Completed Data Hive and unlocked the Chasm Ten 
  Firefight mission. 
  Kizingo Boulevard (30 points): Completed Kizingo Blvd. and unlocked the Mickey 
  character in Firefight. 
  ONI Alpha Site (30 points): Completed ONI Alpha Site and unlocked the Alpha 
  Site Firefight mission. 
  NMPD HQ (30 points): Completed NMPD HQ and unlocked the Romeo character in 
  Firefight. 
  Campaign Complete: Legendary (100 points): Completed Legendary and unlocked 
  the Dare character in Firefight. 
  Junior Detective (10 points): Found the first clue unravelling the mystery. 
  Gumshoe (10 points): Found the 3rd clue unravelling the mystery, alone or with 
  another ODST. 
  Coastal Highway (50 points): Completed Coastal Highway and unlocked the Last 
  Exit Firefight mission. 
  Campaign Complete: Normal (100 points): Completed the Campaign on Normal 
  difficulty. 
  Campaign Complete: Heroic (100 points): Completed the Campaign on Heroic 
  difficulty. 
  Boom, Headshot (5 points): Got 10 automag headshot kills in any level. 
  Stunning! (5 points): Stunned a vehicle with an overcharged plasma pistol and 
  quickly killed the driver. 
  Ewww, Sticky (5 points): Got 5 sticky grenade kills in any level. 
  Heal Up (5 points): Found the first Medical Kiosk and healed yourself. 
  Tourist (5 points): Accessed and downloaded the city map to your VISR. 
  Dark Times (5 points): Killed 5 enemies while using VISR mode. 
  Headcase (5 points): Finished any level with at least one Skull activated. 
  Tayari Plaza (30 points): Completed Tayari Plaza and unlocked the Buck 
  character in Firefight. 
  Uplift Reserve (30 points): Completed Uplift Reserve and unlocked the Dutch 
  character in Firefight. 
  My Clothes! (5 points): Plasma Pistol Overcharged and quickly killed 10 Brutes.