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