I am using the script extender if I recall correctly, and the achievements do unlock prior to this achievement and after this achievement. Only this achievement doesn't seem to work for some reason.
So I did the profile trick, loaded the save with all 7 altars prayed to, and then prayed to the final altar. It did not unlock the achievement, but now the achievement is at 6/7.
So I have 2 assumptions right now why it doesn't work properly:
1. Coop activating the altar does not increase my progress with the achievement.
2. Altar achievement didn't work for some reason before, and now it does unlock a certain altar somehow. ( but still not the achievement when quest progress is 7/7 )
So to fix this I'd probably need to pray at every altar before having them activated and hope I get the right altar. I really don't want to do that though. - Even with someone else his save file, I'd need a save file of every altar unactivated most likely.
