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