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