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