To get the Through a Glass Darkly achievement in State of Decay 2 do the following:
Billboards and radio towers are listed on your map with binocular icons. Go to these locations, scale them and press the aim button to look around at your area. Glance at each of the question mark symbols until they change into something more revealing. After 5 question marks are undone, this achievement will pop.
Scout 45 more locations and you'll also net the following achievement: