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