This is kind of going back on what Hellraiser1977 said, You should make the outline of trophies a light blue and the inside transparent or nothing, and then when you mouse over them you can see how you can unlock them.
Once you get to the point in the game where Shadow Stalkers are constantly popping up in every sector of the map you can see where they are in each sector if you click space to target on an empty section of the map. You will see that you are locked on to a Shadow Stalker but there is no image of one. This will help you avoid them.