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