There are seventeen Jackal tapes throughout the game. The first is given to you by the Journalist. The first set is the eight hidden around the northern territory. The second set is the eight hidden in the southern territory. Simply find all eight of them and then go to the Marina to meet the Journalist and turn them over to him. Use the map here to keep track of which ones you've found.
There is a known glitch with the second set of tapes. Once you've collected the tenth overall tape, every subsquent tape that you pick up will play the same message. Don't worry, the tapes are still being counted, so just collect all of them, keeping track on your own, and the achievement will still unlock once you've found all seventeen.
If you encounter this glitch and still want to know what the last set of tapes say, you can listen to all the audio from the tapes here.