Here is the full list of all 64 Winter Voices achievements.
Achieve a 100% success in every encounter of the sixth episode while playing a Volva with a maximum memory.
Win the last battle of the first season by denying all the shadows statements.
Complete the whole Season 1 of Winter Voices with more than 500 memory.
Complete the whole Season 1 of Winter Voices while playing a Volva.
Here's an achievement for not falling asleep.
Complete the "Secret of the Norns Quest" (DLC) with 100% success in every battle.
During an encounter with them, get hit by an Uncertain Mystery at a distance of 10 or more.
Achieve a 100% success in every encounter of the fifth episode.
Achieve a 100% success in every encounter of the fifth episode while playing a Volva with a maximum memory.
In the "Desert, III" encounter, finish with more than 120% success.
Achieve a 100% success in every encounter of the fourth episode while playing a Volva with a maximum memory.
Nice boat. Nom nom nom.
Win the mountain last encounter without losing more than 10% of your life.
Achieve a 100% success in every encounter of the third episode while playing a Volva with a maximum memory.
Achieve a 100% success in every encounter of the second episode while playing a Volva with a maximum memory.
Achieve a 100% success in every encounter of the first episode while playing a Volva with a maximum memory.
Complete the whole Season 1 of Winter Voices while playing a Weaveress.
Achieve a 100% success in every encounter of the sixth episode.
In the third phase of the "Life" encounter, survive 1 minute. This achievement won't be granted if you're under the protection of "Then We'll Come From The Shadow".
Win the Secret of the Norns encounter without killing any enemy.
Hire Chichi.
Sadly there is no voiceover for this.
Finish the "Winter Voices, II" encounter in less than 18 turns.
Be sick at least once.
Complete the fourth episode after having eliminated every opponent when it was possible.
Obtain the worst score in every major quest of the boat. (Knots, Loading, Rhum)
Achieve a 100% success in every encounter of the third episode.
Burn down your shadow in 10 turns or less.
Pass through the mountain's shadow in 10 turns or more.
Pass through the mountain's shadow in 4 turns or less.
End the ceremony with the 6 initial vivacious memories still present.
In the village at the foot of the mountain, win the secret encounter in 10 turns or less.
Achieve a 100% success in every encounter of the prologue.
Achieve a 100% success in every encounter of the prologue while playing a Volva with a maximum memory.
Leave the Seid after completing the Difficult Path.
Win the last encounter of the Prologue without losing more than 10% of your life.
Leave the never-ending house without surrendering (!) until the end.
Complete the sixth episode.
Complete the whole Season 1 of Winter Voices.
Complete the whole Season 1 of Winter Voices while playing a Huntress.
Complete the whole Season 1 of Winter Voices without any friend. (Imaginary Friend counts as a friend)
Win every Memory of the Season I of Winter Voices.
Complete the fifth episode.
In the "Questions" encounter, finish with 140% success or more.
In the "When I Was Little" encounter, make the memories transform next to you.
Complete the fourth episode.
Complete the fourth episode without activating any Inferno or hidden Inferno.
Achieve a 100% success in every encounter of the fourth episode.
Obtain the best score in every major quest of the boat. (Knots, Loading, Rhum)
It was only a short moment...
Complete the Hall of the Invisible Kingdom in 4 turns or less.
Complete the third episode.
Win 50 encounters.
Complete the second episode.
Hire Ven.
Achieve a 100% success in every encounter of the second episode.
Complete the first episode.
Achieve a 100% success in every encounter of the first episode.
Complete the Prologue.
Hire the Crow.
Leave the Seid without taking the Difficult Path.
Sob or Sniff 20 times.
Watch the Funeral Pyre.
Achieve a 100% success in the third encounter of the prologue (departure of the father) after walking on the "Summer Scent".