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