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