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