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