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