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