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.
Sacrifice 10 Followers.
Beat Shamura without taking damage.
Beat Kallamar without taking damage.
Unlock all fleeces.
Unlock all Follower Skins.
Unlock all tarot cards.
Defeat the One Who Waits.
Unlock all curses.
Unlock all weapons.
Defeat Shamura.
Defeat all opponents in Knucklebones.
Find all 5 locations.
Unlock all doctrines.
Fully Upgrade Cult.
Defeat Kallamar.
Have 666 gold coins.
Gain 20 Followers.
Cook a Follower meat meal.
Reignite the lighthouse.
Catch 1 of every fish.
Beat Leshy without taking damage.
Defeat Heket.
Beat Heket without taking damage.
Take confession.
Sacrifice a Follower.
Salvation awaits the fallen soul.
Gain 10 Followers.
Unlock a new fleece.
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.
No longer a servant, no less than a God.
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.