This achievement is somewhat easily done, but the locations can be hard to find at times. So, I took some time finding a few sites that give overall maps, a checklist and a steam user named Luzzifus who took pictures of the locations.
GrimChecklist:
http://grimchecklist.com/shrines.phpLuzzifus Guide -
https://steamcommunity.com/sharedfiles/filedetails/?id=56298...Interactive Map -
http://the-maphack.com/index.php?page=2&lang=enAnother Map -
http://maps.grimdawn.es/With these utilities, you should have no issues finding the shrines. If you have any questions or tips for this guide, please let me know in the comments before downvoting. Enjoy!