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.
Defeat the One Who Waits.
Unlock all tarot cards.
Defeat all opponents in Knucklebones.
Beat Shamura without taking damage.
Defeat Shamura.
Gain 20 Followers.
Beat Kallamar without taking damage.
Sacrifice 10 Followers.
Find all 5 locations.
Beat Heket without taking damage.
Have 666 gold coins.
Take confession.
Defeat Kallamar.
Defeat Heket.
Unlock all curses.
Unlock all weapons.
Unlock all doctrines.
Fully Upgrade Cult.
Catch 1 of every fish.
Cook a Follower meat meal.
Beat Leshy without taking damage.
A deal that cannot be undone.
Gain 10 Followers.
Unlock a new fleece.
Reignite the lighthouse.
Sacrifice a Follower.
Salvation awaits the fallen soul.
Defeat Leshy.
A new world awaits.
The first devotee to the Cult of the Lamb.
Gain 5 Followers.
Defeat the first mini-boss.
Win a game of Knucklebones.
Let the Word be known.
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.