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