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 stood your ground against the demonic minions and your weapon received the blessing of heavens.
You have proven yourself to be a merciless killer and your weapon received the blessing of hell.
You have found in yourself the balance between the light and the dark and your weapon became the instrument of cosmic equilibrium.
You have faced The One from Beyond and lived. Not many hunters of the Covenant of Crossbow have completed such a feat!