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