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