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