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