Here is the full list of all 38 Towaga: Among Shadows achievements.
Finish a flying phase without getting hit
Exorcise 10 monsters with a single bomb in the flying phase
You achieved The Controller phase
You've exorcised 500 crawlers
You've freed Rok'han from the void corruption
Exorcise 5 monsters by exploding a Bomber
You've exorcised 500 whirlers
You've exorcised 50 casters
You've exorcised 500 creepers
Repel 8 monsters in one blast
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
Unlock all pages from Ikal's Journal
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
Unlock all spells
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)
Petrify a Warper mid air
Use all the different spells in the survival mode
You discovered all the shrines
You defeated Metnal The Void Monger
You finished the Story Mode
Upgrade your build to its maximum
You've freed Anarah from the void corruption
You've exorcised 50 wreckers
You've exorcised 50 warpers
You've exorcised 50 constrainers
You've exorcised 50 bombers