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