Full list of all 48 Cult of the Lamb achievements. It takes around 15-20 hours to unlock all of the achievements in the base game on Windows.
The base game contains 37 achievements, and there are 2 DLC packs containing 11 achievements.
A deal that cannot be undone.
Sacrifice 10 Followers.
Catch 1 of every fish.
Unlock all fleeces.
Unlock all Follower Skins.
Beat Shamura without taking damage.
Beat Kallamar without taking damage.
Unlock all tarot cards.
Defeat the One Who Waits.
Gain 20 Followers.
Beat Heket without taking damage.
Beat Leshy without taking damage.
Defeat all opponents in Knucklebones.
Take confession.
Unlock all weapons.
Defeat Shamura.
Find all 5 locations.
Unlock all curses.
Unlock all doctrines.
Defeat Kallamar.
Fully Upgrade Cult.
Have 666 gold coins.
Unlock a new fleece.
Defeat Heket.
Gain 10 Followers.
Defeat the first mini-boss.
Cook a Follower meat meal.
A new world awaits.
Sacrifice a Follower.
Salvation awaits the fallen soul.
The first devotee to the Cult of the Lamb.
Gain 5 Followers.
Reignite the lighthouse.
Defeat Leshy.
Let the Word be known.
Win a game of Knucklebones.
No longer a servant, no less than a God.
Collect all Relics.
Get your Gold back from Midas.
Complete a row in Purgatory.
Unlock all lore.
Unlock all outfits.
Have 12 Disciples.
Completely Upgrade the Temple.
Hatch 5 eggs.