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