Here is the full list of all 19 Dream Alone achievements.
Death by fire.
Game finished without using power of light.
Finished all levels.
Finished all castle levels.
Finished all battlefield levels.
Death by poisonous gas.
Death by explosion.
Finished all town levels.
Death by electricity.
Finished all sawmill levels.
Finished all cave levels.
Finished all swamp levels.
Died 100 times.
Death by drowning.
Used clone power for the first time.
Finished all forest levels.
Death by moving blades.
Used power of alternative reality for the first time.
Death by spikes.