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