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.
Unlock all tarot cards.
Beat Shamura without taking damage.
Beat Kallamar without taking damage.
Unlock all Follower Skins.
Unlock all fleeces.
Beat Heket without taking damage.
Sacrifice 10 Followers.
Beat Leshy without taking damage.
Take confession.
Defeat the One Who Waits.
Gain 20 Followers.
Defeat Kallamar.
Find all 5 locations.
Defeat all opponents in Knucklebones.
Defeat Shamura.
Unlock all weapons.
Unlock all curses.
Have 666 gold coins.
Unlock all doctrines.
Cook a Follower meat meal.
Defeat Heket.
Fully Upgrade Cult.
Sacrifice a Follower.
Unlock a new fleece.
Catch 1 of every fish.
Reignite the lighthouse.
Salvation awaits the fallen soul.
Gain 10 Followers.
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.
Complete a row in Purgatory.
Collect all Relics.
Get your Gold back from Midas.
Unlock all lore.
Unlock all outfits.
Completely Upgrade the Temple.
Have 12 Disciples.
Hatch 5 eggs.