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