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.
Sacrifice 10 Followers.
Catch 1 of every fish.
Unlock all tarot cards.
Unlock all Follower Skins.
Beat Shamura without taking damage.
Cook a Follower meat meal.
Beat Kallamar without taking damage.
Beat Heket without taking damage.
Unlock all fleeces.
Beat Leshy without taking damage.
Have 666 gold coins.
Defeat the One Who Waits.
Gain 20 Followers.
Defeat Shamura.
Unlock all weapons.
Defeat all opponents in Knucklebones.
Take confession.
Find all 5 locations.
Unlock all doctrines.
Defeat Kallamar.
Fully Upgrade Cult.
Unlock all curses.
Unlock a new fleece.
Defeat Heket.
Sacrifice a Follower.
Salvation awaits the fallen soul.
Gain 10 Followers.
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.
No longer a servant, no less than a God.
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.