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