Here is the full list of all 59 Back to the Future: The Game - there are 30th Anniversary Edition achievements worth 1,000 gamerscore.
Collected every Demerit in the game.
Broke the password code without cheating.
Defeated the Tannen Brothers in six jumps.
Heard about the curious fate of Marshall Strickland.
Perfectly repeated dialog while repeating Doc's temporal experiment.
Returned home.
Prevented the Great Hill Valley Fire.
Solved the saloon puzzle with no more than two trips to the second floor.
Restored Edna's memory.
Had a conversation with a cactus.
Treated Desert Edna to an algae cake.
Emmett completes his spectacular failure at the Expo.
Got your money's worth at the Expo.
Recorded everyone at the Expo.
Completed the glass house maze without going back up the stairs.
Impersonated three people over the phone.
Busted a move, 80's style.
Marty and Emmett head to the Expo.
Gave Emmett his Epiphany.
Broke up Emmett and Edna.
Took the fewest possible trips to Emmett's lab.
Got Trixie ready to make Edna jealous.
Messed with Emmett's cleanser.
Emmett is prophetically honest about his marriage prospects.
Crafted a mind map of Emmett that reveals him to be a "Degenerate Criminal."
Revealed the Hill Valley hooliganism rate.
Offered algae cakes to everyone.
Got a good look at Trixie's postcard.
Rescued Citizen Brown from the Citizen Plus program.
Escaped from Marty's cell.
Layout Biff and escape the speakeasy.
Examined every container of contraband in the speakeasy.
Jumped into the Decycling Bin.
Got caught with Lorraine's booze.
Got caught with Einstein.
Got caught making out with Jennifer.
Use the spray can to paint Marty's band name in the alley.
Coax Edna out of the courthouse with the buzzer.
Listened to all tourist audio guides in Hill Valley.
Used the DeLorean parts to enter Hill Valley.
Defeated Kid Tannen.
Got a gangster's girl to do the right thing.
Dried a cop out.
Enjoyed a full set from Hill Valley's leading songstress.
Found "Chuckles Lenart".
Got a full explanation of your situation.
Rescued Arthur with minimal fuss.
Tracked down a missing accountant.
Rescued Doc from Kid Tannen.
Acquired Emmett's Rocket Drill.
Managed to get 190-proof alcohol delivered to Emmett's.
Discovered the origin of the "new" DeLorean.
Delivered the subpoeana to Arthur McFly.
Namechecked "Back to the Future" creators.
Talked Emmett into completing the Rocket Drill.
Traveled back in time to rescue Doc.
Got Doc's Notebook back from Biff.
No mistakes when making rocket fuel.
Find a hidden passageway.