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