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.
Sacrifice 10 Followers.
Defeat the One Who Waits.
Beat Shamura without taking damage.
Unlock all fleeces.
Unlock all Follower Skins.
Defeat Shamura.
Unlock all tarot cards.
Defeat all opponents in Knucklebones.
Beat Kallamar without taking damage.
Beat Heket without taking damage.
Find all 5 locations.
Defeat Kallamar.
Gain 20 Followers.
Beat Leshy without taking damage.
Defeat Leshy.
Unlock all weapons.
Defeat Heket.
Have 666 gold coins.
Catch 1 of every fish.
Unlock all doctrines.
Fully Upgrade Cult.
Unlock all curses.
Unlock a new fleece.
Take confession.
Gain 10 Followers.
Cook a Follower meat meal.
Sacrifice a Follower.
Salvation awaits the fallen soul.
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.
Collect all Relics.
Get your Gold back from Midas.
Complete a row in Purgatory.
Unlock all lore.
Unlock all outfits.
Have 12 Disciples.
Hatch 5 eggs.
Completely Upgrade the Temple.