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