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