Here is the full list of all 33 Tony Stewart's Sprint Car Racing achievements worth 1,000 gamerscore.
Won 4 split-screen races in one session
Bought a part in Career
Won a race in split-screen
Started a team racing TQ Midget Cars
Created a custom car
Won 10 races in Online Multiplayer
Won 10 races
Completed 10 races in Online Multiplayer
Completed a race in Online Multiplayer
Won a race
Won a race in Online Multiplayer
Created a character
Win 25 races
Win 50 races
Win 75 races
Win 100 races
Win 200 races
Complete a 100% length race
Win a 100% length race
Race at every track
Complete a season in a TQ Midget Car
Complete a season in a 305 Sprint Car
Complete a season in a 410 Sprint Car
Win a season in a TQ Midget Car
Win a season in a 305 Sprint Car
Win a season in a 410 Sprint Car
Complete one season in Career
Complete 5 seasons in Career
Complete 10 seasons in Career
Start a team racing 305 Sprint Cars
Start a team racing 410 Sprint Cars
Win a race in Career mode
Earn $5,000,000 in Career