By far the best spot to achieve this is right here:
In the southwest corner of The Glen, northeast of the fast travel point labelled "Metro: Glen South," and west, slightly south of "Velentino Alley." The area you want is beneath the intersecting overpass.
There is a large, open alley here with a massive skull mural and a cluster of thugs, surrounded by at least SIX
hackable devices if not more. If you stand on the shipping container looking right at the skull you can overlook the area and hack each device one by one in a loop, all will count toward the achievement.
This will unlock the achievement very rapidly, don't bother grinding it in the tutorial.