To get this achievement you have to be in the multiplayer menu, then choose Wolfpack and pick discovery mode. There 8 missions in total to do, 7 to learn the basics of the wolfpack mode and in the last one you have to use all what you've learned from the previous missions.
They are fun to play and you will get points to level up as well even if there not that difficult. I completed them all in about half an hour. Once you completed the last one the achievement pops up.