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