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