Here is the full list of all 34 Ashen achievements.
Defeat the Elder Dark Sissna.
Reunite the Listener and Human hearts.
Discover the secret of Contemplation.
Defeat the brute near Vagrant's Rest.
Wear the Umbral Veil.
Wear each relic once.
Complete Flokir's journey.
Leap into the dark portal.
Unlock all townsfolk outfits.
Defeat the Shadow of the Ashen.
Meet Kol the wildman.
Untangle Sissna's weave at the Palace of Lathyrus.
Acquire all lanterns.
Complete Vorsa's journey.
Complete Jokell's journey.
Construct all houses in Vagrant's Rest.
Complete Eila's journey.
Hunt a roamar.
Hunt the corb near Vagrant's Rest.
Unlock all crafting specialities.
Travel the shadow pathways.
Defeat Touma and Souma.
Defeat the Listener Matriarch.
Take a ride in Eila's barrel.
Free the Diasora pup.
Hunt a squork.
Defeat the Elder Dark Ukkoto.
Hunt a rafet.
Claim Vagrant's Rest.
Hunt a Deer.
Defeat Sissna in the Children of Sissna mode.
Defeat the Elder Dark Riak.
Defeat Riak in the Children of Sissna mode.
Acquire all Kol's armors.