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