This is part of the Lair of the Shadow Broker DLC that was included in the new edition of the game. This is not part of the main storyline, however, it is doable anytime after it becomes available after meeting Liara on Illium.
Strangely with this version, you unlock it as soon as you meet the actual shadow broker on his ship, right before the fight. In the original game I remember this unlocking after you defeated him, but either way, this achievement is unmissable when doing this mission.