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