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