This is gained throughout side missions called "BLACKNET MISSION" or playing campaign.
Sidemissions to do this on are usually in yellow or have yellow stars. You can always look at your map by hitting [start] then (A) to mark a waypoint on the star location. In these areas with the marked stars you wanna look for the targets who are marked "Hunting" should be in yellow above there heads. Just try to consume them by hitting (B) then. (Y) This is tricky because the one you want to cosume will have other's watching him. This will come naturally about halfway through the game or sooner depending on how many side missions you complete. Consume 10 Hunting and achievements is yours.
Follow this video if you are confused on how this achievement works video will show how to get start and the rest you'll find throughout playing:
Credit for video: NextGenTactics