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

Forge the Axe! (100 points): Complete the entire game. 
Brutal Boost (20 points): Get 100% Titan Bonus. 
Golden Boost (100 points): Get "MAX" Titan Bonus. 
Trial of the Firstborn (25 points): Clear the first twenty waves in Trials of Tyris.
Trial of the Queen (50 points): Clear the first forty waves in Trials of Tyris.
Trial of the Snake Pit (100 points): Clear all 60 waves in Trials of Tyris. 
Gnome Intimidator (5 points): Deliver 30 hits to those Gnomes, if you think you can.
Gnome Persecutor (10 points): Show your savvy by bringing your total Gnome hits to 60.
Gnome Oppressor (15 points): Hit Gnomes a total of 120 times to prove your prowess. 
Island of Axir Class A+ (15 points): Complete "Island of Axir" with an A+ ranking.
Diyar Class A+ (15 points): Complete "Diyar Highlands" with an A+ ranking. 
Highland Fortress Class A+ (15 points): Complete "Highland Fortress" with an A+ ranking.
Firstborn Class A+ (15 points): Defeat "Firstborn" with an A+ ranking. 
Titan Wastelands Class A+ (15 points): Complete "Titan Wastelands" with an A+ ranking.
Turtle Titan Class A+ (15 points): Complete "Grave of the Turtle Titan" with an A+ 
ranking. 
Second Born Class A+ (15 points): Complete "Second Born" with an A+ ranking. 
City of the Dead Class A+ (15 points): Complete "City of the Dead" with an A+ ranking.
Queen of the Dead Class A+ (15 points): Complete "Queen of the Dead" with an A+ ranking.
Fiends Path Class A+ (20 points): Complete "Fiends Path" with an A+ ranking. 
Fiend's Pet Class A+ (20 points): Complete "Fiend's Pet" with an A+ ranking. 
The Last Titan Class A+ (25 points): Complete "The Last Titan" with an A+ ranking.
Death=Adder Class A+ (35 points): Complete "Death=Adder" with an A+ ranking. 
Abrax Master (20 points): Defeat 20 foes on the Abrax without getting dismounted.
Lynth Master (20 points): Defeat 20 foes on the Lynth without getting dismounted.
Krommath Master (20 points): Defeat 20 foes on the Krommath without getting dismounted.
Mirigore Master (20 points): Defeat 20 foes on the Mirigore without getting dismounted.