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