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