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