Hey everyone, just a quick video showing you how to unlock this achievement. For this one, it's in the Necropolis map, and you only need to find the grave of Irina's Pony. This is located right before the exit, between two statues playing the violin. You have to be pretty close to it in order to "use" it, so just watch for that. I also show where the extra chests are in this area.
Chest: If you keep going East past the grave, then you'll come to an area where Helsing will say he feels something. If you light the brazier's in the right order, you'll active a portal to the other side with two chests there. Hope the video helps!