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