Here is the full list of all 38 Towaga: Among Shadows achievements.
Unlock all Bright-one masks
Unlock all instruments
Unlock all relics
Use all the different spells in the survival mode
Repel 8 monsters in one blast
Listen to all Kurro's anecdotes
Upgrade your build to its maximum
You've exorcised 50 wreckers
Resist 10 waves in the survival mode
Finish a flying phase without getting hit
Unlock all the memories
Unlock all missing pages from Ikal's Journal
You've exorcised 50 constrainers
Resist 5 waves in the survival mode
You've exorcised 50 bombers
You discovered all the shrines
You've exorcised 50 warpers
You defeated Metnal The Void Monger
You finished the Story Mode
Unlock all spells
Fight all creatures
Unlock all pages from Ikal's Journal
You've freed Anarah from the void corruption
You've exorcised 500 crawlers
You achieved The Controller phase
Exorcise 5 monsters by exploding a Bomber
You've exorcised 50 casters
You've exorcised 500 whirlers
Exorcise 10 monsters with a single bomb in the flying phase
You've exorcised 500 creepers
You've freed Rok'han from the void corruption
Petrify a Warper mid air
You've exorcised 500 swarmers
You achieved The Illusionist phase
The light granted you with the ability to fly
You completed the prologue
Unlock all outfits
Use all the spells in one single phase (Void Touch)