All characters and levels
Press [Y], [B], [X], [Y], [Down], [Right], [Up], [Left], [L]x2, [Right]x2, [Down], [Up], [R], [X], [Left], [B]x2, [Down] at the main menu.
All default levels
Press [B]x3, [L], [Right], [Down], [Y], [Up], [Left], [X], [B], [Down], [Up], [R], [L], [Down]x2 at the main menu.
All bonus levels
Press [Up]x2, [Down]x2, [Left], [Right], [Left], [Right], [B], [X], [Y] at the main menu.
All race levels
Press [B], [Y], [X], [B], [L], [X], [R], [Y], [L], [X], [R], [B] at the main menu.
Complete all current objectives
Pause game play in story mode, then press [X]x2, [B], [X]x2, [Y], [X]x2, [L], [R].