Here is the full list of all 34 Ashen achievements.
Defeat Riak in the Children of Sissna mode.
Defeat the Elder Dark Sissna.
Defeat the Elder Dark Riak.
Complete Flokir's journey.
Reunite the Listener and Human hearts.
Hunt a roamar.
Defeat the brute near Vagrant's Rest.
Hunt the corb near Vagrant's Rest.
Wear the Umbral Veil.
Wear each relic once.
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.
Acquire all lanterns.
Complete Eila's journey.
Construct all houses in Vagrant's Rest.
Complete Vorsa's journey.
Acquire all Kol's armors.
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.
Discover the secret of Contemplation.
Hunt a Deer.
Defeat the Elder Dark Ukkoto.
Hunt a squork.
Claim Vagrant's Rest.
Hunt a rafet.
Defeat Sissna in the Children of Sissna mode.