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