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