Full list of all 34 20 Minutes Till Dawn achievements. It takes around 20-25 hours to unlock all of the achievements in the base game on Windows.
The base game contains 24 achievements, and there are 8 DLC packs containing 10 achievements.
Survive Darkness 15 with Yuki.
Use the Magic Bow to survive Darkness 15.
Survive Darkness 15 with Luna.
Survive Darkness 15 with Hastur
Survive Darkness 15 with Raven.
Survive Darkness 15 with Dasher.
Use the Cyclone Sword to survive Darkness 15.
Use the Salvo Knives to survive Darkness 15.
Use the Watering Gun to survive Darkness 15.
Use Katana to survive Darkness 15.