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