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