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