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