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