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