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