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