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