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