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