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.
Unlock all fleeces.
Unlock all Follower Skins.
Sacrifice 10 Followers.
Beat Kallamar without taking damage.
Beat Heket without taking damage.
Beat Shamura without taking damage.
No longer a servant, no less than a God.
Unlock all tarot cards.
Defeat the One Who Waits.
Defeat all opponents in Knucklebones.
Defeat Shamura.
Gain 20 Followers.
Find all 5 locations.
Unlock all weapons.
Take confession.
Defeat Kallamar.
Have 666 gold coins.
Fully Upgrade Cult.
Unlock all doctrines.
Cook a Follower meat meal.
Beat Leshy without taking damage.
Unlock all curses.
Defeat Heket.
Unlock a new fleece.
Sacrifice a Follower.
Salvation awaits the fallen soul.
Catch 1 of every fish.
Gain 10 Followers.
Reignite the lighthouse.
Defeat Leshy.
Win a game of Knucklebones.
A new world awaits.
Let the Word be known.
Gain 5 Followers.
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.