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