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.
Had a conversation with a cactus.
Treated Desert Edna to an algae cake.
Recorded everyone at the Expo.
Busted a move, 80's style.
Returned home.
Prevented the Great Hill Valley Fire.
Defuse the standoff while climbing to the second floor no more than two times.
Restored Edna's memory.
Emmett completes his spectacular failure at the Expo.
Complete the glass house maze without going back up the stairs.
Get your money's worth at the Expo.
Impersonated three people over the phone.