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