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

  Welcoming Committee (10 points): Complete the Tutorial mission. 
  Martian Tea Party (10 points): Complete 2 missions for the Red Faction. 
  Spread the Word (10 points): Liberate Parker Sector. 
  Death From Above (20 points): Liberate Dust Sector. 
  Friendly Skies (30 points): Liberate Badlands Sector. 
  Don't Tread On Me (40 points): Liberate Oasis Sector. 
  Coup D'etat (50 points): Liberate Eos Sector. 
  Red Dawn (100 points): Liberate Mars. 
  Insurgent (5 points): Complete 5 Guerrilla Actions. 
  Guerrilla (10 points): Complete 25 Guerrilla Actions. 
  Freedom Fighter (15 points): Complete 50 Guerrilla Actions. 
  Revolutionary (25 points): Complete all Guerrilla Actions. 
  Clean and Righteous! (15 points): Destroy 5 High Importance targets. 
  Warp Speed (15 points): Beat all Transporter Pro times. 
  Got Any Fingers Left? (15 points): Beat all Pro times in Demolitions Master. 
  Lost Memories (25 points): Locate all missing radio tags. 
  Working the Land (25 points): Mine all ore locations. 
  Free Your Mind (25 points): Destroy all instances of propaganda. 
  One Man Army (25 points): Complete 25 killing sprees during the Campaign. 
  Disaster Area (50 points): Destroy 1 billion credits worth of EDF property. 
  Broken Supply Line (10 points): Destroy 250 EDF supply crates. 
  Power to the People (10 points): Raise the Morale of 3 sectors to 100%. 
  Tank Buster (10 points): Blow up 100 small hydrogen tanks. 
  Best Friends Forever (10 points): Kill 100 EDF with the sledgehammer during 
  the Campaign. 
  Coming Down! (10 points): Destroy 50 EDF owned buildings. 
  Freed Space (10 points): Destroy 50 EDF flyers. 
  Just the Beginning (5 points): Win a Matchmaking match. 
  Start of Something Special (5 points): Play 5 Matchmaking matches. 
  Doing Your Part (10 points): Kill 10 enemies in a Matchmaking Match. 
  Juggernaut (5 points): Destroy a Siege target. 
  Doozer (5 points): Reconstruct a Damage Control target. 
  Grab Some Popcorn (5 points): Enter Spectator mode and enjoy the show! 
  Try Anything Once (10 points): Finish a match in every mode. 
  Check Your Map (10 points): Finish a match on every map in Multiplayer. 
  Tools of the Trade (10 points): Score a kill with every weapon in Multiplayer. 
  Field Tested (10 points): Earn 1,000 XP in Multiplayer. 
  Battle Scarred (25 points): Earn 10,000 XP in Multiplayer. 
  War Veteran (50 points): Earn 100,000 XP in Multiplayer. 
  A Winner is You! (20 points): Win 250 matchmaking games. 
  Topher Would Be Proud (20 points): Play 250 matchmaking games. 
  Courier of Pain (20 points): Score 5,000 kills in Multiplayer. 
  Experimenter (10 points): Complete 4 hidden challenges in Multiplayer. 
  Detective (20 points): Complete 8 hidden challenges in Multiplayer. 
  Mad Genius (40 points): Complete 16 hidden challenges in Multiplayer. 
  Jack of all Trades (10 points): Score 10 kills while wearing each backpack. 
  The High and Mighty (10 points): Kill a flying opponent using a remote charge 
  stuck to them. 
  Party Time (10 points): Play all Wrecking Crew modes once. 
  Can't Get Enough (20 points): Play every mode on all maps in Wrecking Crew. 
  Wrecking Ball (40 points): Score 25 million points worth of destruction in 
  Wrecking Crew. 
  Red Faction Member (50 points): Play online with another player who has 
  completed the Campaign.