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