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.
No longer a servant, no less than a God.
Sacrifice 10 Followers.
Unlock all fleeces.
Defeat the One Who Waits.
Beat Shamura without taking damage.
Unlock all tarot cards.
Defeat Shamura.
Defeat all opponents in Knucklebones.
Find all 5 locations.
Beat Kallamar without taking damage.
Take confession.
Defeat Kallamar.
Have 666 gold coins.
Gain 20 Followers.
Unlock all weapons.
Beat Heket without taking damage.
Fully Upgrade Cult.
Unlock all doctrines.
Unlock all curses.
Defeat Heket.
Unlock a new fleece.
Catch 1 of every fish.
Beat Leshy without taking damage.
Cook a Follower meat meal.
Sacrifice a Follower.
Salvation awaits the fallen soul.
Gain 10 Followers.
Win a game of Knucklebones.
Reignite the lighthouse.
Defeat Leshy.
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.
Complete a row in Purgatory.
Get your Gold back from Midas.
Unlock all outfits.
Have 12 Disciples.
Unlock all lore.
Completely Upgrade the Temple.
Hatch 5 eggs.