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