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