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