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