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