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 Follower Skins.
Defeat the One Who Waits.
Unlock all fleeces.
Beat Shamura without taking damage.
Beat Kallamar without taking damage.
Beat Heket without taking damage.
Defeat Shamura.
Defeat all opponents in Knucklebones.
Find all 5 locations.
Defeat Kallamar.
Catch 1 of every fish.
Defeat Heket.
Take confession.
Cook a Follower meat meal.
Gain 20 Followers.
Unlock all curses.
Unlock all weapons.
Unlock all doctrines.
Fully Upgrade Cult.
Have 666 gold coins.
Unlock a new fleece.
Sacrifice a Follower.
Salvation awaits the fallen soul.
Gain 10 Followers.
Reignite the lighthouse.
Defeat Leshy.
Beat Leshy without taking damage.
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.
Collect all Relics.
Complete a row in Purgatory.
Get your Gold back from Midas.
Have 12 Disciples.
Unlock all outfits.
Hatch 5 eggs.
Unlock all lore.
Completely Upgrade the Temple.