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.
Defeat the One Who Waits.
Unlock all Follower Skins.
Unlock all fleeces.
Beat Shamura without taking damage.
Beat Kallamar without taking damage.
Beat Heket without taking damage.
Defeat Shamura.
Beat Leshy without taking damage.
Unlock all tarot cards.
Gain 20 Followers.
Defeat all opponents in Knucklebones.
Sacrifice 10 Followers.
Find all 5 locations.
Catch 1 of every fish.
Have 666 gold coins.
Defeat Kallamar.
Take confession.
A deal that cannot be undone.
Unlock a new fleece.
Cook a Follower meat meal.
Reignite the lighthouse.
Unlock all curses.
Unlock all weapons.
Unlock all doctrines.
Fully Upgrade Cult.
Defeat Leshy.
Defeat Heket.
Win a game of Knucklebones.
A new world awaits.
Sacrifice a Follower.
Salvation awaits the fallen soul.
Gain 10 Followers.
Defeat the first mini-boss.
Let the Word be known.
The first devotee to the Cult of the Lamb.
Gain 5 Followers.
Collect all Relics.
Get your Gold back from Midas.
Complete a row in Purgatory.
Unlock all lore.
Unlock all outfits.
Have 12 Disciples.
Completely Upgrade the Temple.
Hatch 5 eggs.