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