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