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