If you are playing Story Mode, complete the level after obtaining ‘True Jedi’ and this will unlock at the end at the results screen. If replaying a level in Free Play, as soon as you obtain ‘True Jedi’, you can save and quit the level and it will unlock.
Here is a list of the requirements for each level:
Prologue: The Battle of Endor - 80,000 studs
Chapter 1: Assault on Jakku - 80,000 studs
Chapter 2: Escape From the Finalizer - 120,000 studs
Chapter 3: Niima Outpost - 120,000 studs
Chapter 4: The Eravana - 65,000 studs
Chapter 5: Maz’s Castle - 100,000 studs
Chapter 6: Attack on Takodana - 120,000 studs
Chapter 7: The Resistance - 35,000 studs
Chapter 8: Starkiller Sabotage - 50,000 studs
Chapter 9: Destroy Starkiller Base - 100,000 studs
Chapter 10: The Finale - 70,000 studs
Epilogue: Luke’s Island - 30,000 studs
Adventure Level 1: Poe to the Rescue - 120,000 studs
Adventure Level 2: Lor San Tekka’s Return - 45,000 studs
Adventure Level 3: Rathtar Hunting - 65,000 studs
Adventure Level 4: The Crimson Corsair - 50,000 studs
Adventure Level 5: Trouble Over Taul - 60,000 studs
Adventure Level 6: Ottegan Assault - 175,000 studs