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 curses.
Unlock all Follower Skins.
Reignite the lighthouse.
A deal that cannot be undone.
Defeat the One Who Waits.
Beat Shamura without taking damage.
Beat Kallamar without taking damage.
Unlock all tarot cards.
Sacrifice 10 Followers.
Unlock all fleeces.
Take confession.
Defeat Shamura.
Cook a Follower meat meal.
Defeat Heket.
Beat Heket without taking damage.
Defeat Leshy.
Beat Leshy without taking damage.
Have 666 gold coins.
Catch 1 of every fish.
Defeat all opponents in Knucklebones.
Find all 5 locations.
Defeat Kallamar.
Unlock all doctrines.
Unlock all weapons.
Unlock a new fleece.
Win a game of Knucklebones.
Fully Upgrade Cult.
Gain 20 Followers.
A new world awaits.
Sacrifice a Follower.
Salvation awaits the fallen soul.
The first devotee to the Cult of the Lamb.
Gain 5 Followers.
Gain 10 Followers.
Let the Word be known.
Defeat the first mini-boss.
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.