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