Here is the full list of all 4 CROSSBOW: Bloodnight achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
You have faced The One from Beyond and lived. Not many hunters of the Covenant of Crossbow have completed such a feat!
You have found in yourself the balance between the light and the dark and your weapon became the instrument of cosmic equilibrium.
You have proven yourself to be a merciless killer and your weapon received the blessing of hell.
You have stood your ground against the demonic minions and your weapon received the blessing of heavens.