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.
A deal that cannot be undone.
Unlock all Follower Skins.
Unlock all tarot cards.
Unlock all fleeces.
Take confession.
Beat Leshy without taking damage.
Sacrifice 10 Followers.
Beat Heket without taking damage.
Have 666 gold coins.
Cook a Follower meat meal.
Defeat the One Who Waits.
Gain 20 Followers.
Defeat Shamura.
Defeat all opponents in Knucklebones.
Find all 5 locations.
Unlock all weapons.
Unlock all curses.
Defeat Kallamar.
Unlock all doctrines.
Fully Upgrade Cult.
Defeat Heket.
Unlock a new fleece.
Catch 1 of every fish.
Gain 10 Followers.
Reignite the lighthouse.
Sacrifice a Follower.
Salvation awaits the fallen soul.
Defeat Leshy.
Win a game of Knucklebones.
A new world awaits.
Gain 5 Followers.
Defeat the first mini-boss.
Let the Word be known.
The first devotee to the Cult of the Lamb.
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.