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