Here is the full list of all 16 Face It - there are A game to fight inner demons achievements.
Complete Lux in Tenebris without taking any damage.
Complete World 4
Unlock the Will Sigil.
Complete World 3
Unlock the Vision Sigil.
Unlock the Truth Sigil.
Complete World 2
Unlock the Reconnection Sigil.
Unlock the Love Sigil.
Complete World 1
Complete any level from darkest world.
Unlock the Passion Sigil.
Complete a level with only one point of light remaining.
Unlock the Fight Sigil.
Unlock any level from darkest world.
Complete any level without taking any damage.