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