Here is the full list of all 12 Back to the Future - Episode 5: OUTATIME trophies - there are 8 bronze, 3 silver and 1 gold.
Defuse the standoff while climbing to the second floor no more than two times.
Had a conversation with a cactus.
Recorded everyone at the Expo.
Get your money's worth at the Expo.
Complete the glass house maze without going back up the stairs.
Busted a move, 80's style.
Returned home.
Prevented the Great Hill Valley Fire.
Restored Edna's memory.
Treated Desert Edna to an algae cake.
Emmett completes his spectacular failure at the Expo.
Impersonated three people over the phone.