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.
A deal that cannot be undone.
Sacrifice 10 Followers.
Unlock all Follower Skins.
Beat Shamura without taking damage.
Beat Kallamar without taking damage.
Beat Heket without taking damage.
Unlock all fleeces.
Unlock all tarot cards.
Defeat Leshy.
Beat Leshy without taking damage.
Take confession.
Defeat the One Who Waits.
Defeat Shamura.
Unlock all weapons.
Fully Upgrade Cult.
Defeat all opponents in Knucklebones.
Have 666 gold coins.
Unlock all doctrines.
Find all 5 locations.
Unlock all curses.
Defeat Kallamar.
Gain 20 Followers.
Unlock a new fleece.
Reignite the lighthouse.
Catch 1 of every fish.
Win a game of Knucklebones.
Sacrifice a Follower.
Cook a Follower meat meal.
Defeat Heket.
A new world awaits.
Salvation awaits the fallen soul.
Gain 10 Followers.
Let the Word be known.
The first devotee to the Cult of the Lamb.
Gain 5 Followers.
Defeat the first mini-boss.
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.