Tom Clancy's Splinter Cell: Double Agent

While traveling throughout the story you must do at least two of the three things mentioned and also be trusted by the NSA above 33%.

3 Qualities of a Hero
-Save Lambart in the last mission of the game by shooting Jamie instead. You will also receive an achievement for saving Lambart.
-At the end of the third JBA headquarters mission do not blame Enrica or allow the bomb to be blown up. Pick the option that allows you to stop the bomb without blaming Enrica. She will then be shot in the head.
-Save Hisham by instead sniping the guard with the red hat in the Kinshasa Mission. You will also receive an achievement for saving Hisham's life.

After doing two of the things mentioned and having a trust level above 33% for the NSA, once you beat the game there should be a bonus mission with yet another bomb for Sam fisher to disarm. Complete this mission to receive the Hero achievement. I found it easiest to kill the guy that goes to the left of the ship then go to the side of the staircase, hold form the railing, and wait for the guy in a red suit to walk outside. Climb over the railing and hide behind something. When he goes to the side with the body then you go inside and sneak up and kill Moss. The bomb is in the same room.