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