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.
Sacrifice 10 Followers.
No longer a servant, no less than a God.
Beat Kallamar without taking damage.
Unlock all Follower Skins.
Unlock all tarot cards.
Unlock all fleeces.
Beat Shamura without taking damage.
Beat Heket without taking damage.
Beat Leshy without taking damage.
Cook a Follower meat meal.
Have 666 gold coins.
Defeat the One Who Waits.
Take confession.
Defeat Shamura.
Defeat all opponents in Knucklebones.
Find all 5 locations.
Gain 20 Followers.
Unlock all curses.
Defeat Kallamar.
Unlock all weapons.
Unlock all doctrines.
Defeat Heket.
Fully Upgrade Cult.
Unlock a new fleece.
Catch 1 of every fish.
Sacrifice a Follower.
Salvation awaits the fallen soul.
Gain 10 Followers.
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.
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.