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