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