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