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.
Defeat the One Who Waits.
Beat Shamura without taking damage.
Beat Kallamar without taking damage.
Unlock all Follower Skins.
Unlock all tarot cards.
Unlock all fleeces.
Defeat all opponents in Knucklebones.
Win a game of Knucklebones.
Defeat Shamura.
Beat Heket without taking damage.
Find all 5 locations.
Catch 1 of every fish.
Sacrifice 10 Followers.
Have 666 gold coins.
Defeat Kallamar.
Beat Leshy without taking damage.
A deal that cannot be undone.
Take confession.
Defeat Leshy.
Gain 20 Followers.
Defeat Heket.
Unlock all weapons.
Unlock all curses.
Fully Upgrade Cult.
Unlock a new fleece.
Unlock all doctrines.
Cook a Follower meat meal.
Sacrifice a Follower.
A new world awaits.
Salvation awaits the fallen soul.
Defeat the first mini-boss.
Gain 10 Followers.
Reignite the lighthouse.
Let the Word be known.
Gain 5 Followers.
The first devotee to the Cult of the Lamb.
Collect all Relics.
Complete a row in Purgatory.
Get your Gold back from Midas.
Unlock all outfits.
Unlock all lore.
Have 12 Disciples.
Completely Upgrade the Temple.
Hatch 5 eggs.