Here is the full list of all 34 9 Years of Shadows achievements.
Complete the bestiary.
Find all eight cartographer's journals.
Break the curse.
Successfully perform four quick heals with Radical Acceptance in a row.
Upgrade your Light Bar to the maximum.
Allow Hibino to complete his mission.
Defeated the Logon Duck in the Upper Quarters.
Upgrade your Vitality to the maximum.
Rescue all of the musicians.
Acquire all of the progression abilities.
Defeat Draythus in The Orphanage.
Defeat Miria.
Find ten secret rooms.
Defeat Limo and Nissi.
Defeat Maelzel.
Defeat Link.
Save Talos' Heart in Talos Core.
Defeat the Horned God.
Defeat Locrian Sentinel in Talos Core.
Defeat the Reaper.
Defeat the Gear of Erebus.
Defeat Frinise.
Defeat Hekate's Illusion in the Capra Cauldrons.
Defeat the Shadow of Demise.
Defeat Leno.
Defeat the Shadow of Despair.
Defeat Issa Kabeer.
Defeat the Mask of Andros in the Eucalyptus Garden.
Defeat Ulf.
Defeat the Shadow of Hope.
Kill the same common enemy ten times.
Defeat the Tantalus Roach in the Forgotten Pond.
Defeat the Dwarven Guard.
Perform a Lullaby for the first time.