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