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