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