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.
Unlock all Follower Skins.
Unlock all tarot cards.
Sacrifice 10 Followers.
No longer a servant, no less than a God.
Cook a Follower meat meal.
Unlock all fleeces.
Take confession.
Beat Shamura without taking damage.
Beat Kallamar without taking damage.
Defeat the One Who Waits.
Gain 20 Followers.
Beat Heket without taking damage.
Defeat Shamura.
Defeat all opponents in Knucklebones.
Find all 5 locations.
Defeat Kallamar.
Unlock all curses.
Unlock all weapons.
Unlock all doctrines.
Have 666 gold coins.
Fully Upgrade Cult.
Beat Leshy without taking damage.
Defeat Heket.
Unlock a new fleece.
Catch 1 of every fish.
Gain 10 Followers.
Reignite the lighthouse.
Defeat Leshy.
Win a game of Knucklebones.
A new world awaits.
Sacrifice a Follower.
Salvation awaits the fallen soul.
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.
Unlock all lore.
Unlock all outfits.
Have 12 Disciples.
Completely Upgrade the Temple.
Hatch 5 eggs.