Game Cheats:
Complete the following Tasks to earn the listed achievement. To view
your achievements and stats in Steam, select "Community", then search
for the game hub that corresponds to [Dark Echo]. Select the "View
Stats" drop down option, then choose the option for your username's
achievements.
Achievement - How to unlock:
Escape the Darkness - Complete all levels in the Dark World.
Escape the Light - Complete all levels in the Light World.
Treasure Hunter - Collect all hidden treasures.