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