Yes Boss is a secret achievement/trophy in Deus Ex: Human Revolution. It is earned by persuading David Sarif to give you information about the breach in the firewall that led to the attack on Sarif Industries.
Walkthrough[]
This has to be done after you come back from the FEMA facility in Highland Park. You will be asked to debrief David Sarif. Before you can do that, however, Pritchard will ask to see you in your office.
When you go to Pritchard, he will tell you that he has discovered a security breach in the company's firewall, and will tell you to ask David Sarif about it.
When you go up to Sarif's office, Jensen will confront David Sarif about this installed security breach. See the page on Sarif's dialogue challenge for information on how to succesfully persuade him.
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