Larian Studios Forums Divinity: Original Sin 2 Divinity - Original Sin 2 - Bugs & Technical Problems The Seven Altars Achievement not working

I can confirm that in coop, you have to personally activate every altar to get the achievement. I recently did this myself with the script extender and if my friend prayed at one, I did not get credit for it. With a fresh playthrough, praying at them all myself got me credit.