There are 8 tracks in the game. Five of them are locked until after you advance through the circuits or in single races.
1. Tranquility Island
2. Grander Canyon
3. Snowball Alley
Unlocked after you complete races in Tranquility Island, Grander Canyon & Snowball Alley in Single Race or Circuit
4. Paradise Lost
5. Rushin' River
6. Mine Bender
Unlocked after you complete races in Paradise Lost, Rushin' River & Mine Bender in Single Race or Circuit
7. Glacier Speedway
8. Arctic Antics
Race in all 8 to get the achievement.