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