Here is the full list of unlockable trophies for Back to the Future The Game Episode III: Citizen Brown for the PS3.
All Good Dogs Go To Utah (Silver) – Got caught with Einstein
Final Solution (Gold) – Layout Biff and escape the speakeasy
Hidden Treasure (Bronze) – Examine every container of contraband in the speakeasy
Hill Valley Tourist (Bronze) – Listen to all tourist audio guides in Hill Valley
Hope You’re Insured (Silver) – Use the DeLorean parts to enter Hill Valley
Intervention (Silver) – Got caught with Lorraine’s booze
Into the Garbage Chute, McFly-boy (Silver) – Jumped the Decycling Bin
Marty and the Pinheads (Bronze) – Use the spray can to paint Marty’s band name in the alley
One Bad Apple (Bronze) – Collect every Demerit in the game
Ruin it for Everyone (Bronze) – Coax Edna out of the courthouse with the buzzer
Seven Minutes in Heaven (Silver) – Got caught making out with Jennifer