Here is the full list of all 34 Erica trophies - there are 12 bronze, 18 silver, 3 gold and 1 platinum.
Unlock all bronze, silver and gold trophies.
Find all of the hidden documents, and finish.
See all major endings.
Accept the butterfly mask and become priestess.
Stay at Delphi House after being sedated.
Kiss Blake... then injure him, and finish.
Make perfume with Hannah, and finish.
Find all of the Delphic Epsilon locks, and finish.
Find all of the oleander petals, and finish.
Spy on people whenever possible, and finish.
See the fox four times, and finish.
Burn down Delphi house and leave with friends.
Hang out in the attic with Tobi, and finish.
Play through without killing anyone, and finish.
Save Tobi's life, and finish.
Join Lucien at Delphi House.
Annoy Tobi, Kirstie, and Hannah, and finish.
Do the rounds with Kirstie, and finish.
Sign Kirstie's card, and finish.
Find the Delphic Epsilon slide in Ballard's lab, and finish.
Find the Chief Inspector with his most prized possession, and finish.
Disobey Blake at every turn, and finish.
Find all of the corpses in the game, and finish.
Burn down Delphi House and leave alone.
Kill everyone in one playthrough, and finish.
Find Erica's favorite photo of Alodie and prove you're magic, and finish.
Calm Kirstie when Hannah bleeds over the piano, and finish.
Receive a note from the Chief Inspector, and finish.
Find Akal Johar's ledger and a key to the code within, and finish.
Escape Steinbeck's office without getting caught, and finish.
Slap Tobi, and finish.
Tell Lucien to get out of Erica's room, and finish.
Try Blake's patience at the front desk, and finish.
Wipe a tear from Tobi's cheek, and finish.