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.
Unlock all Follower Skins.
Unlock all fleeces.
Beat Heket without taking damage.
Beat Kallamar without taking damage.
Unlock all tarot cards.
Unlock all curses.
Defeat the One Who Waits.
Gain 20 Followers.
Beat Shamura without taking damage.
Defeat all opponents in Knucklebones.
Defeat Shamura.
Unlock all weapons.
Have 666 gold coins.
Find all 5 locations.
Defeat Kallamar.
Cook a Follower meat meal.
Fully Upgrade Cult.
Unlock all doctrines.
Take confession.
Beat Leshy without taking damage.
Defeat Heket.
Gain 10 Followers.
Unlock a new fleece.
Catch 1 of every fish.
Sacrifice a Follower.
Salvation awaits the fallen soul.
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.
Complete a row in Purgatory.
Get your Gold back from Midas.
Unlock all lore.
Unlock all outfits.
Have 12 Disciples.
Completely Upgrade the Temple.
Hatch 5 eggs.