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