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