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

North America (Easy) (10 points): Complete the North American Campaign Easy difficulty.
North America (Medium) (20 points): Complete the North American Campaign Medium difficulty.
North America (Hard) (30 points): Complete the North American Campaign Hard difficulty.
Northern Europe (Easy) (10 points): Complete the Northern Europe Campaign Easy difficulty.
Northern Europe (Medium) (20 points): Complete the Northern Europe Campaign Medium difficulty.
Northern Europe (Hard) (30 points): Complete the Northern Europe Campaign Hard difficulty.
Africa (Easy) (10 points): Complete the Africa Campaign Easy difficulty.
Africa (Medium) (20 points): Complete the Africa Campaign Medium difficulty.
Africa (Hard) (30 points): Complete the Africa Campaign Hard difficulty.
Pacific (Easy) (10 points): Complete the Pacific Campaign Easy difficulty.
Pacific (Medium) (20 points): Complete the Pacific Campaign Medium difficulty.
Pacific (Hard) (30 points): Complete the Pacific Campaign Hard difficulty.
Victory (50 points): Complete every campaign.
Versatile (10 points): Earn 3 star rank in every class on Easy.
Resourceful (20 points): Earn 3 star rank in every class on Medium.
Flawless (30 points): Earn 3 star rank in every class on Hard.
Go Getter (10 points): Earn 25 stars in a campaign.
Man of Action (30 points): Earn 50 stars in a campaign.
Hot Shot (50 points): Earn 100 stars in Campaign Mode.
Take Charge (5 points): Win one level with the bots not finishing tasks.
Born Leader (10 points): Win all levels with the bots not finishing tasks.
Beat the Clock (5 points): Win one Stopwatch match.
Stick to the Plan (5 points): Win one Objective match.
Tempus Fugit (10 points): Win all levels in Stopwatch mode.
Mission Accomplished (10 points): Win all levels in Objective mode.
Paved the Way (20 points): Win all levels as Strogg.
Sent Them Packing (20 points): Win all levels as GDF.
Top Dog (30 points): Instant Action Complete.
Groundwork (15 points): Training Complete.
Commando: Recruit (10 points): Achieve Rank 1 ten times as a Soldier or Aggressor.
Commando: Veteran (20 points): Achieve Rank 2 ten times as a Soldier or Aggressor.
Commando: Expert (30 points): Achieve Rank 3 ten times as a Soldier or Aggressor.
Corpsman: Recruit (10 points): Achieve Rank 1 ten times as a Medic or Technician.
Corpsman: Veteran (20 points): Achieve Rank 2 ten times as a Medic or Technician.
Corpsman: Expert (30 points): Achieve Rank 3 ten times as a Medic or Technician.
Emissary: Recruit (10 points): Achieve Rank 1 ten times as a Covert-Ops or Infiltrator.
Emissary: Veteran (20 points): Achieve Rank 2 ten times as a Covert-Ops or Infiltrator.
Emissary: Expert (30 points): Achieve Rank 3 ten times as a Covert-Ops or Infiltrator.
Munitions: Recruit (10 points): Achieve Rank 1 ten times as a Field-Ops or Oppressor.
Munitions: Veteran (20 points): Achieve Rank 2 ten times as a Field-Ops or Oppressor.
Munitions: Expert (30 points): Achieve Rank 3 ten times as a Field-Ops or Oppressor.
Fortifier: Recruit (10 points): Achieve Rank 1 ten times as a Engineer or Constructor.
Fortifier: Veteran (20 points): Achieve Rank 2 ten times as a Engineer or Constructor.
Fortifier: Expert (30 points): Achieve Rank 3 ten times as a Engineer or Constructor.
Team Player (20 points): 100 Revives 250 Ammo Packs Given 100 Stars: Field-Ops or Oppressor Medic or Technician.
Annihilator (20 points): Destroyed: 50 Deployables 100 Vehicles 100 Stars: Field-Ops or Oppressor Soldier or Aggressor.
Medicine Man (20 points): 250 Health Packs Given 100 Revives 100 Supply Crates 100 Medic or Technician Stars.
One Man Army (20 points): 50 Objectives Completed 25 Forward Spawns Captured 250 Total Stars in all Classes.
Handyman (20 points): 100 Repairs 100 Constructs 100 Engineer Stars.
Commander (30 points): 25 Stars in Every Class on Strogg or GDF 300 Total Stars.