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