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