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 Follower Skins.
Unlock all fleeces.
Sacrifice 10 Followers.
Unlock all tarot cards.
Take confession.
Beat Kallamar without taking damage.
Defeat the One Who Waits.
Gain 20 Followers.
Beat Shamura without taking damage.
Beat Leshy without taking damage.
Beat Heket without taking damage.
Defeat all opponents in Knucklebones.
Defeat Shamura.
Unlock all curses.
Unlock all weapons.
Fully Upgrade Cult.
Unlock all doctrines.
Cook a Follower meat meal.
Find all 5 locations.
Defeat Kallamar.
Have 666 gold coins.
Catch 1 of every fish.
Unlock a new fleece.
Defeat Heket.
Gain 10 Followers.
Sacrifice a Follower.
Salvation awaits the fallen soul.
Reignite the lighthouse.
Defeat Leshy.
Win a game of Knucklebones.
A new world awaits.
Gain 5 Followers.
Let the Word be known.
The first devotee to the Cult of the Lamb.
A deal that cannot be undone.
Defeat the first mini-boss.
No longer a servant, no less than a God.
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.