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