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