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