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

Driven in excess of 100 miles (5 points): Drive a total of 100 miles in Career mode.
Driven in excess of 250 miles (10 points): Drive a total of 250 miles in Career mode.
Driven in excess of 500 miles (20 points): Drive a total of 500 miles in Career mode.
Driven in excess of 1000 miles (25 points): Drive a total of 1000 miles in Career mode.
Tier 2 Career Points Milestone (10 points): Achieve maximum points up to the end of Tier 2 in Career mode.
Tier 4 Career Points Milestone (10 points): Achieve maximum points up to the end of Tier 4 in Career mode.
Tier 6 Career Points Milestone (20 points): Achieve maximum points up to the end of Tier 6 in Career mode.
Tier 8 Career Points Milestone (20 points): Achieve maximum points up to the end of Tier 8 in Career mode.
Maximum Career Points Milestone (45 points): Achieve maximum points up to the end of Tier 11 in Career mode.
FWD Rally Veteran (20 points): Win all FWD Rally events in Career mode.
4WD Rally Veteran (20 points): Win all 4WD Rally events in Career mode.
Classic Rally Veteran (20 points): Win all Classic Rally events in Career mode.
RWD Rally Veteran (20 points): Win all RWD Rally events in Career mode.
Rallycross Veteran (20 points): Win all Rallycross events in Career mode.
Rally Raid T1 Veteran (20 points): Win all Rally Raid T1 events in Career mode.
Rally Raid T4 Truck Veteran (20 points): Win all Rally Raid T4 Truck events in Career mode.
CORR Super Buggy Veteran (20 points): Win all CORR Super Buggy events in Career mode.
CORR Pro 4 Truck Veteran (20 points): Win all CORR Pro 4 Truck events in Career mode.
Hill Climb Veteran (20 points): Win all Hill Climb events in Career mode.
Hill Climb Big Rig Veteran (20 points): Win all Hill Climb Big Rig events in Career mode.
Crossover Veteran (20 points): Win all Crossover events in Career mode.
Champion of Champions Winner (20 points): Win the Champion of Champions event in Career mode.
National Rally Veteran (20 points): Win all National Rally events in Career mode.
Own 15 Vehicles (15 points): Own 15 vehicles in Career mode.
Own 30 Vehicles (30 points): Own 30 vehicles in Career mode.
Own All Vehicles (45 points): Own all of the vehicles in Career mode.
First Podium Finish (15 points): Achieve a podium finish in any game mode.
First Victory (15 points): Win a race in any game mode.
Hat Trick - 3 Wins In A Row (15 points): Win 3 races in a row in any game mode.
5 Wins (10 points): Win a total of 5 races in any game mode.
10 Wins (15 points): Win a total of 10 races in any game mode.
20 Wins (20 points): Win a total of 20 races in any game mode.
First 20m Jump (15 points): Perform a jump over 20m (or equivalent feet) in any game mode.
First Clean Race (15 points): Complete a race without colliding with anything in any game mode.
Manual Transmission (10 points): Win a race using manual transmission in any game mode.
Top Speed (10 points): Reach a speed of at least 135mph in a race in any game mode.
All Tracks (20 points): Race on every track (not including shakedown stages) in any game mode.
First Xbox Live Rally Win (20 points): Win a ranked rally race on Xbox Live.
First Xbox Live Hill Climb Win (20 points): Win a ranked hill climb race on Xbox Live.
First Xbox Live Clean Race (20 points): The player must complete a ranked race on Xbox Live without colliding with anything.
Win Shell Rally Australia (20 points): Win the Shell Rally Australia in Championship mode.
Win Sparco Rally Espana (20 points): Win the Sparco Rally Espana in Championship mode.
Win Brembo Rallye Italia (20 points): Win the Brembo Rallye Italia in Championship mode.
Win Rally Deutschland (20 points): Win the Rally Deutschland in Championship mode.
Win BP Ultimate Rally UK (20 points): Win the BP Ultimate Rally UK in Championship mode.
Win Arai Japanese Alpine Rally (20 points): Win the Arai Japanese Alpine Rally in Championship mode.
European Rally Champion (25 points): Win the European Rally Championship.
International Rally Champion (40 points): Win the International Rally Championship.
Global Rally Champion (60 points): Win the Global Rally Championship.