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