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