Here is the full list of all 13 Lucid Dream achievements.
Rescue Chiron from eternal pain.
Open the gate to the congress.
Summon Metatron.
Free the lost soul.
Find your way back to the dream.
Make deal with Oneiromancer.
Help the Moon.
Escape from the house.
Resolve Dr. Frank's riddle.
Find the way to change the past.
Escape from the nightmare.
Defeat the astral worm.
Get back your mother.