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