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