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