No missable achievements (plus 16 unknown)
Sign in with Steam or Xbox to track your progress, and:
Complete any level without taking any damage.
Unlock any level from darkest world.
Complete a level with only one point of light remaining.
Unlock the Fight Sigil.
Unlock the Passion Sigil.
Unlock the Will Sigil.
Complete any level from darkest world.
Unlock the Love Sigil.
Unlock the Truth Sigil.
Unlock the Vision Sigil.
Unlock the Reconnection Sigil.
Complete World 1
Complete World 2
Complete World 4
Complete World 3
Complete Lux in Tenebris without taking any damage.