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