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.
Beat Kallamar without taking damage.
Sacrifice 10 Followers.
Beat Shamura without taking damage.
Beat Heket without taking damage.
Defeat the One Who Waits.
Unlock all Follower Skins.
Unlock all fleeces.
Unlock all tarot cards.
Defeat all opponents in Knucklebones.
Defeat Shamura.
Gain 20 Followers.
Find all 5 locations.
Unlock all curses.
Beat Leshy without taking damage.
Unlock all weapons.
Defeat Kallamar.
Cook a Follower meat meal.
Fully Upgrade Cult.
Unlock all doctrines.
Take confession.
Catch 1 of every fish.
Have 666 gold coins.
Defeat Heket.
Sacrifice a Follower.
Salvation awaits the fallen soul.
Unlock a new fleece.
Gain 10 Followers.
Defeat Leshy.
Reignite the lighthouse.
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.
Complete a row in Purgatory.
Collect all Relics.
Get your Gold back from Midas.
Unlock all lore.
Completely Upgrade the Temple.
Unlock all outfits.
Have 12 Disciples.
Hatch 5 eggs.