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