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.
Unlock all doctrines.
No longer a servant, no less than a God.
Reignite the lighthouse.
A deal that cannot be undone.
Unlock all Follower Skins.
Unlock all fleeces.
Beat Kallamar without taking damage.
Unlock all tarot cards.
Beat Shamura without taking damage.
Beat Heket without taking damage.
Beat Leshy without taking damage.
Defeat Leshy.
Defeat the One Who Waits.
Defeat Shamura.
Sacrifice 10 Followers.
Defeat all opponents in Knucklebones.
Find all 5 locations.
Defeat Kallamar.
Gain 20 Followers.
Defeat the first mini-boss.
Unlock all curses.
Unlock all weapons.
Defeat Heket.
Cook a Follower meat meal.
Take confession.
Gain 5 Followers.
Gain 10 Followers.
The first devotee to the Cult of the Lamb.
Catch 1 of every fish.
Have 666 gold coins.
Sacrifice a Follower.
Unlock a new fleece.
Let the Word be known.
Win a game of Knucklebones.
A new world awaits.
Salvation awaits the fallen soul.
Fully Upgrade Cult.
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.