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 fleeces.
Unlock all Follower Skins.
Beat Heket without taking damage.
Beat Leshy without taking damage.
Defeat the One Who Waits.
Gain 20 Followers.
Unlock all tarot cards.
Defeat all opponents in Knucklebones.
Defeat Shamura.
Beat Shamura without taking damage.
Find all 5 locations.
Defeat Kallamar.
Beat Kallamar without taking damage.
Take confession.
Sacrifice a Follower.
Unlock all weapons.
Defeat Heket.
Fully Upgrade Cult.
Unlock a new fleece.
Catch 1 of every fish.
Unlock all doctrines.
Unlock all curses.
Gain 10 Followers.
Have 666 gold coins.
Reignite the lighthouse.
Defeat Leshy.
Cook a Follower meat meal.
Salvation awaits the fallen soul.
Win a game of Knucklebones.
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.
Have 12 Disciples.
Hatch 5 eggs.
Completely Upgrade the Temple.