Complete each achievement to get the allotted gamerscore.

Unlockables

100 Wins (30) Win 100 or more events.
1000 Combat Points (20) Score 1000 or more combat points in a single event.
200 Wins (40) Win 200 or more events.
36 Second Time Trial (20) Finish a Time Trial on any course in 36 seconds or less.
50 Second Time Trial (10) Finish a Time Trial on any course in 50 seconds or less.
50 Wins (20) Win 50 or more events.
600 Combat Points (10) Score 600 or more combat points in a single event.

Armageddon Series Gold (20) Get first place in the Armageddon Series.
Armageddon Series II Gold (30) Get first place in the Armageddon Series II.
Aurora Master (10) Win 10 races with an Aurora class racecraft.

Cardinal Series Gold (10) Get first place in the Cardinal Series.
Cardinal Series II Gold (20) Get first place in the Cardinal Series II.
Cardinal Series III Gold (30) Get first place in the Cardinal Series III.
Combat Race Master (20) Win 20 Combat Race events.
Connect 2 Opponents (10) Using the primary fire of the Cable, attach two opponents together.

Demolition Series Gold (20) Get first place in the Demolition Series.
Destroy An Opponent (10) Destroy an opponent during an event.
Destructor (20) Destroy 3 opponents in a single event.
Destructor II (40) Destroy all 7 opponents in a single event.

Hurricane Series Gold (30) Get first place in the Hurricane Series.

I'm Better Than You (10) Win a splitscreen Quick Race against a human pilot.

Knockout Master (20) Win 20 Knockout events.

Magnet Mayhem Master (20) Win 20 Magnet Mayhem events.
Mercury Master (10) Win 10 races with a Mercury class racecraft.

Nightfall Series Gold (20) Get first place in the Nightfall Series.
Nightfall Series II Gold (30) Get first place in the Nightfall Series II.

Perfect Start (10) Perfectly time a brake-boost at the start of a race to get maximum acceleration.
Perfectionist (40) Get 40 points in every series in your career.
Phoenix Master (10) Win 10 races with a Phoenix class racecraft.
Prodigy Series Gold (30) Get first place in the Prodigy Series.

Remove Magnets (10) Using a single brake-boost, knock 10 or more magnets off your craft.
Remove Rockets (10) Using a brake-boost, knock an attached rocket off your craft.
Remove Weapons By Rolling (10) Do a barrel-roll to remove an attached weapon.

Scramble Series Gold (30) Get first place in the Scramble Series.
Show-off (20) Lap all 7 opponents in one event.
Skirmish Series Gold (10) Get first place in the Skirmish Series.
Smokescreen Master (20) Affect all 7 opponents with the same Smoke Bomb.
Snag Opponent (10) Using both the primary and secondary fire, attach an opponent to the ground with a Cable.
Speed Demon (10) Accelerate your racecraft to 750 km/h (469 mph) (excluding during Time Dilation)
Speed Demon II (20) Accelerate your racecraft to 900 km/h (563 mph) (excluding during Time Dilation)

Throttle Series Gold (10) Get first place in the Throttle Series.
Throttle Series II Gold (20) Get first place in the Throttle Series II.
Throttle Series III Gold (30) Get first place in the Throttle Series III.
Titan Master (10) Win 10 races with a Titan class racecraft.
Try All Tracks (30) Finish a race in all of the tracks in every environments (51 total).

Velocity Au Naturel (20) Win a Velocity race without using any weapons.
Velocity Master (20) Win 20 Velocity events.

World Championship Gold (30) Get first place in the World Championship Series.

Xbox LIVE Master (40) Win 50 events on Xbox LIVE.
Xbox LIVE Novice (20) Win a single event on Xbox LIVE.