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