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.
Sacrifice 10 Followers.
No longer a servant, no less than a God.
Unlock all Follower Skins.
Unlock all fleeces.
Defeat the One Who Waits.
Unlock all tarot cards.
Beat Shamura without taking damage.
Defeat all opponents in Knucklebones.
Defeat Shamura.
Find all 5 locations.
Gain 20 Followers.
Beat Kallamar without taking damage.
Beat Heket without taking damage.
Unlock all weapons.
Beat Leshy without taking damage.
Defeat Kallamar.
Defeat Heket.
Fully Upgrade Cult.
Unlock all curses.
Unlock all doctrines.
Have 666 gold coins.
Cook a Follower meat meal.
Take confession.
Unlock a new fleece.
Catch 1 of every fish.
Sacrifice a Follower.
Gain 10 Followers.
Reignite the lighthouse.
Defeat Leshy.
Win a game of Knucklebones.
A new world awaits.
Salvation awaits the fallen soul.
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.
Get your Gold back from Midas.
Collect all Relics.
Complete a row in Purgatory.
Unlock all lore.
Have 12 Disciples.
Unlock all outfits.
Completely Upgrade the Temple.
Hatch 5 eggs.