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.
Unlock all Follower Skins.
Unlock all tarot cards.
Defeat the One Who Waits.
Sacrifice 10 Followers.
Beat Kallamar without taking damage.
Unlock all fleeces.
Defeat all opponents in Knucklebones.
Defeat Shamura.
Beat Shamura without taking damage.
Beat Heket without taking damage.
Gain 20 Followers.
Beat Leshy without taking damage.
Have 666 gold coins.
Find all 5 locations.
Take confession.
Defeat Kallamar.
Unlock all curses.
Unlock all weapons.
Fully Upgrade Cult.
Unlock all doctrines.
Sacrifice a Follower.
Cook a Follower meat meal.
Unlock a new fleece.
Catch 1 of every fish.
Defeat Heket.
Gain 10 Followers.
Reignite the lighthouse.
Salvation awaits the fallen soul.
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.
No longer a servant, no less than a God.
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.