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