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