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