Here is the full list of all 12 Bloody Faerie achievements.
Defeat the first wave.
Defeat three diffrent bosses.
Defeat 16 bosses.
Finish the 32nd wave.
Find 9 diffreant weapons.
Kill 128 enemies at night.
Do 64 headshots.
Kill 256 enemies.
Do 1024 damage with every weapon kind.
Play game for 6 full in-game days and night.
Kill 16 enemies with a knife or sword.
Defeat a wave killing all enemies.