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