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.
Unlock all tarot cards.
Beat Shamura without taking damage.
Beat Kallamar without taking damage.
Sacrifice 10 Followers.
Beat Heket without taking damage.
Unlock all Follower Skins.
Beat Leshy without taking damage.
Unlock all fleeces.
Defeat the One Who Waits.
Defeat Shamura.
Defeat all opponents in Knucklebones.
Find all 5 locations.
Have 666 gold coins.
Unlock all curses.
Unlock all doctrines.
Unlock all weapons.
Fully Upgrade Cult.
Defeat Kallamar.
Gain 20 Followers.
Catch 1 of every fish.
Unlock a new fleece.
Defeat Heket.
Take confession.
Sacrifice a Follower.
Gain 10 Followers.
Cook a Follower meat meal.
Salvation awaits the fallen soul.
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.
No longer a servant, no less than a God.
Collect all Relics.
Get your Gold back from Midas.
Complete a row in Purgatory.
Unlock all lore.
Unlock all outfits.
Have 12 Disciples.
Completely Upgrade the Temple.
Hatch 5 eggs.