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