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