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