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