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