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