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