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