Here is the full list of all 40 Wings of Vi achievements.
Defeat Electram without taking any damage.
Defeat Pr'Gora without taking any damage.
Defeat Jeh'Oul.
Defeat Azurel.
Reach the upper platform in the underwater area in Sinister Grotto.
Defeat Myougi without taking any damage.
Watch over the broken bridge.
Unlock all weapons.
Defeat the Twin Orcs.
Defeat Myougi again.
Defeat the Ancient Constructs.
Defeat Kratarac.
Defeat Amethyst.
Defeat Terravine.
Travel below each platform during the first minecart sequence.
Make all the birds in Vi's home fly away.
Read all the stories in the Floating Keep library.
Defeat the Dark Annihilator without letting any bombs touch the floor.
Defeat the Dark Annihilator.
Defeat Electram.
Defeat Pr'Gora.
Defeat Myougi.
Defeat Myougi having done maximum damage to her each time she deactivates her shield (4 damage).
Find a secret.
Beat Rubi in the obstacle course race.
Defeat Amethyst without taking any damage.
Talk to a person who hid themself in the caves.
Defeat the Dark Annihilator without taking any damage.
Beat the last segment in the Sinister Grotto while having defeated all spawns of Terravine along the way.
Defeat Terravine without taking any damage.
Defeat Terravine with at least one minecart left in the room.
Defeat Kratarac without taking any damage.
Defeat the Ancient Constructs without taking any damage.
Defeat the Ancient Constructs only enraging one of his three heads.
Defeat Myougi again without taking any damage.
Defeat the Twin Orcs without taking any damage.
Defeat Azurel without taking any damage.
Defeat Jeh'Oul without taking any damage.
Defeat Supreme Jeh'Oul and save the world.
Defeat Supreme Jeh'Oul without taking any damage.