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