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