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.
Sacrifice 10 Followers.
Unlock all Follower Skins.
Unlock all fleeces.
Cook a Follower meat meal.
Unlock all tarot cards.
Defeat all opponents in Knucklebones.
Beat Heket without taking damage.
Unlock all weapons.
Defeat the One Who Waits.
Defeat Shamura.
Beat Shamura without taking damage.
Take confession.
Find all 5 locations.
Unlock all doctrines.
Defeat Kallamar.
Beat Kallamar without taking damage.
Unlock all curses.
Fully Upgrade Cult.
Beat Leshy without taking damage.
Gain 20 Followers.
Have 666 gold coins.
Defeat Heket.
Unlock a new fleece.
Gain 10 Followers.
Catch 1 of every fish.
Sacrifice a Follower.
Salvation awaits the fallen soul.
Defeat Leshy.
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.
Reignite the lighthouse.
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.