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