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.
Beat Shamura without taking damage.
Beat Kallamar without taking damage.
Unlock all Follower Skins.
Unlock all tarot cards.
Unlock all fleeces.
Defeat the One Who Waits.
Gain 20 Followers.
Beat Heket without taking damage.
Beat Leshy without taking damage.
Defeat Shamura.
Defeat all opponents in Knucklebones.
Have 666 gold coins.
Find all 5 locations.
Cook a Follower meat meal.
Unlock all curses.
Defeat Kallamar.
Unlock all weapons.
Unlock all doctrines.
Sacrifice a Follower.
Fully Upgrade Cult.
Take confession.
Defeat Heket.
Salvation awaits the fallen soul.
Reignite the lighthouse.
Gain 10 Followers.
Unlock a new fleece.
Catch 1 of every fish.
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.
No longer a servant, no less than a God.
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.