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

Escaped the Catacombs (20 points): Complete the Catacombs.
Enchanted Forest (10 points): Complete the Twilight Falls.
Freed Hunter (30 points): Complete the Valley of Avalar.
Close Warfang Gate (30 points): Complete the City of Warfang.
Killed the Golem (40 points): Complete Dragon City Golem.
Underground City Doors (20 points): Complete the Underground Ruins.
Flood the Valley (30 points): Complete the Dragon Dam.
Stop the Destroyer (30 points): Complete the Destroyer.
Burned Lands crossed (40 points): Complete the Burned Lands.
Reached Malefor's Lair (20 points): Complete the Floating Islands.
Destroy Malefor (30 points): Complete Malefor's Lair.
Complete the game (130 points): Complete the game a 100%.
Entrepreneur (50 points): Upgrade all your elements to Max Level.
Buddy System (50 points): Complete the game with at least 90% of the time in 2 Players Mode.
One Large Step (15 points): Complete one Armor Set.
Armory (15 points): Complete all Armor Sets.
Bodyguard (5 points): Bring the Artilleryman back to his catapult in less than 5 minutes.
Grublin Slayer (15 points): Kill 225 Grublins.
Grublin Bane (20 points): Kill 450 Grublins.
Orc Slayer (15 points): Kill 100 Orcs.
Orc Demolisher (20 points): Kill 200 Orcs.
Last Rampart (5 points): Close Warfang Gate without dying once.
Troll Slayer (10 points): Kill 10 Trolls.
Wyvern Slayer (5 points): Kill 45 Wyverns.
Dark Knight (10 points): Kill 70 Shadows.
Elitist (15 points): Upgrade one element to Max Level.
Dragon Spirit (25 points): Find all Elemental Upgrades.
Elite Destroyer (15 points): Kill all Elite Enemies.
Grappler (5 points): Perform 100 Enemy Grabs.
Air Grappler (5 points): Perform 100 Enemy Air Grabs.
Juggler (10 points): Throw 200 Enemies into the Air.
Combo Maker (5 points): Perform a 70 hit Combo string.
Combo Master (5 points): Perform a 125 hit Combo string.
Button Smasher (10 points): Perform a 300 hit Combo string.
Unattainable (10 points): Dodge all Golem attacks in Chamber of Retribution.
Dragon Heart (25 points): Find all Health Upgrades.
Berserker (5 points): Launch 20 Fury attacks.
Savior (5 points): Protect all the Cheetah's houses in the village.
Master of Fire (5 points): Eliminate 75 Enemies with a Fire attack.
Master of Electricity (5 points): Eliminate 75 Enemies with an Electric attack.
Master of Wind (5 points): Eliminate 75 Enemies with a Wind attack.
Master of Poison (5 points): Eliminate 75 Enemies with a Poison attack.
Master of Ice (5 points): Eliminate 75 Enemies with an Ice attack.
Master of Fear (5 points): Eliminate 75 Enemies with a Fear attack.
Executioner (10 points): Kill 625 Enemies.
Army Slayer (20 points): Kill 1000 Enemies.
Dragon Mind (25 points): Find all XP Crystals.
Unlocked Bonus (40 points): Unlocked all Bonus galleries.
Golem Wrecker (30 points): Kill the Golem without dying once.
Dragon Assassin (40 points): Kill Malefor without dying once.