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