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