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.
Beat Kallamar without taking damage.
No longer a servant, no less than a God.
Unlock all fleeces.
Beat Shamura without taking damage.
Unlock all Follower Skins.
Defeat the One Who Waits.
Gain 20 Followers.
Unlock all tarot cards.
Sacrifice 10 Followers.
Defeat Shamura.
Defeat all opponents in Knucklebones.
Find all 5 locations.
Unlock all curses.
Unlock all weapons.
Unlock all doctrines.
Take confession.
Defeat Kallamar.
Catch 1 of every fish.
Have 666 gold coins.
Fully Upgrade Cult.
Cook a Follower meat meal.
Beat Heket without taking damage.
Defeat Heket.
Unlock a new fleece.
Gain 10 Followers.
Sacrifice a Follower.
Salvation awaits the fallen soul.
Reignite the lighthouse.
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.
Complete a row in Purgatory.
Get your Gold back from Midas.
Have 12 Disciples.
Unlock all lore.
Completely Upgrade the Temple.
Unlock all outfits.
Hatch 5 eggs.