Here is the full list of all 27 Dreamwalker: Never Fall Asleep trophies - there are 6 bronze, 15 silver, 5 gold and 1 platinum.
Unlock every Trophy.
Collect all Postcards and Stamps.
Release Sandra from the Nightmare.
Complete 3 Hidden Object Puzzles with no more than 5 mistakes in each one.
Complete all Hidden Object Puzzles without using a hint.
Find 32 Dreamer's Sheep.
Finish all Minigames without skipping.
Finish all Meditation Minigames without skipping.
Record the murderer's confession.
Get to Allan's atelier.
Find the hard evidence.
Escape the prison cell.
Break into the mayor's cabinet.
Read all the notes placed throughout the game.
Find 16 Dreamer's Sheep.
Find the book about the Nightmare.
Save Hellen from the car wreckage.
Escape the carriage.
Get into the Tower.
Finish any Hidden Object Puzzle in less than 30 seconds.
Find Sandra's diary.
Finish three Minigames in a row without skipping.
Confront Sandra's trauma.
Complete any Hidden Object Puzzle without using a hint.
Find 3 Hidden Objects in 3 seconds.
Finish a Minigame in less than 1 minute.
Find your first Dreamer's Sheep.