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