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.
Sacrifice 10 Followers.
No longer a servant, no less than a God.
Unlock all tarot cards.
Unlock all fleeces.
Unlock all Follower Skins.
Beat Shamura without taking damage.
Beat Kallamar without taking damage.
Beat Heket without taking damage.
Beat Leshy without taking damage.
Take confession.
Have 666 gold coins.
Cook a Follower meat meal.
Unlock all weapons.
Defeat all opponents in Knucklebones.
Defeat the One Who Waits.
Gain 20 Followers.
Defeat Shamura.
Fully Upgrade Cult.
Unlock all doctrines.
Find all 5 locations.
Defeat Kallamar.
Unlock all curses.
Defeat Heket.
Unlock a new fleece.
Catch 1 of every fish.
Reignite the lighthouse.
Sacrifice a Follower.
Salvation awaits the fallen soul.
Gain 10 Followers.
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.
Collect all Relics.
Complete a row in Purgatory.
Get your Gold back from Midas.
Unlock all lore.
Have 12 Disciples.
Completely Upgrade the Temple.
Unlock all outfits.
Hatch 5 eggs.