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