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