Here is the full list of all 29 Star Wars Episode I Racer achievements worth 1,000 gamerscore.
Complete a Mirrored Race
Hit 10 enemies with Sebulba's weapon
Win a race with Sebulba
Purchase all of the best upgrades
Unlock Sebulba
Unlock Bozzie Baranta
Unlock Slide Paramita
Complete Invitational Podracing Circuit
Finish all races in first place
Complete Galactic Podracing Circuit
Reach 1000 MPH
Complete Semi-Pro Podracing Circuit
Unlock Wan Sandage
Unlock "Bullseye" Baranta
Complete Amateur Podracing Circuit
Unlock Fud Sang
Repair your engines from "warning" back to stable as Anakin
Taunt during a boost
Max out your Pit Droid crew
Unlock Aldar Beedo
Complete a Boost start
Purchase your first upgrade
Unlock Teemto Pagalies
Finish your first race
Come in first place
Reach 700 MPH
Set a new lap record
Perform a boost
Taunt your opponents