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