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