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