The following are standard unlocks for earning 1st place in Single Player events.

Unlockable	How to unlock
Circuitry 2-2	Tron City Rooftops (Round 1)
Circuitry 2-3	Sub-Level Station (Round 1)
Circuitry 3-1	Disc Arena (Round 1)
Circuitry 3-2	ISO City Disc Arena (Round 2)
Circuitry 3-3	City Sub-levels (Round 2)
Circuitry 3-4	ISO City Light Cycle Arena (Round 2)
Classic Light Cycle (1 of 2)	City Light Cycle Grid (Round 1)
Classic Light Cycle (2 of 2)	Outlands Light Cycle Grid (Round 2)
Flynn's Light Cycle	Stadium Battle (Round 3)
Helmet 5	Outer Highways Race (Round 1)
Helmet 6	Stadium Race (Round 1)
Helmet 7	Outlands Canyon Run (Round 1)
Helmet 8	City Underground Run (Round 2)
Helmet 9	Into the Void Run (Round 2)
Long Shot Turret (1 of 2)	Void's Edge Battle (Round 1)
Long Shot Turret (2 of 2)	Power Station Battle (Round 1)
Modern Cycle Circuitry 2	Tron City Race (Round 2)
Modern Cycle Circuitry 3	Outlands Race (Round 2)
Standard Cycle Circuitry 2	Light Cycle Arena (Round 1)
Standard Cycle Circuitry 3	Outlands Light Cycle Arena (Round 1)
Tank Circuitry 2	Sub-Level Bay Battle (Round 1)
Tank Circuitry 3	Outer Highways Battle (Round 2)