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