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