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