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.
Beat Shamura without taking damage.
Take confession.
Beat Kallamar without taking damage.
Unlock all fleeces.
Unlock all Follower Skins.
Beat Heket without taking damage.
Unlock all tarot cards.
Unlock all weapons.
Defeat the One Who Waits.
Have 666 gold coins.
Defeat Shamura.
Defeat all opponents in Knucklebones.
Cook a Follower meat meal.
Find all 5 locations.
Defeat Kallamar.
Fully Upgrade Cult.
Unlock all doctrines.
Beat Leshy without taking damage.
Gain 20 Followers.
Unlock all curses.
Catch 1 of every fish.
Unlock a new fleece.
Defeat Heket.
Gain 10 Followers.
Sacrifice a Follower.
Salvation awaits the fallen soul.
Defeat Leshy.
Reignite the lighthouse.
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.
Unlock all lore.
Unlock all outfits.
Have 12 Disciples.
Completely Upgrade the Temple.
Hatch 5 eggs.