Optional Missions:
- Kill the diplomat from a haystack
- Kill Rogers from a bench
Head to Kingston and go to the Assassins Bureau. Talk to Anto to start this mission. Go to the marked location, use Eagle Vision and find the Italian diplomat by the beach. Tail the diplomat. You don't need to be too close to him; just maintain enough distance and keep him in your sight to avoid de-synchronization.
The diplomat's first stop has a haystack where you can hide and where you can take him out, as part of your first optional mission. You can go to that location ahead of him but you still need to wait for him to walk and maintain enough distance. There are guards near the haystack; you can take out the one beside the haystack near the bushes. This will give you clearance to hide in the nearby haystack without alarming the nearby guards. The target will stand beside the haystack and his escorts will leave him. Use this chance to kill him.
Wearing the diplomat's clothes as disguise, go to the fancy ball to find your target. Rogers will be able to recognize you immediately, so stay out of his sight. For your second optional objective, you need to assassinate him from a bench. There's one to your left. You can see some people sitting down on this particular aisle as well so it's fairly recognizable. This bench branches off from the walkway on the left side entrance guarded by security. You don't need to do anything after sitting but to wait. When Rogers walks in front of you, kill him. After the assassination, quickly flee away from the scene and lose your heat then talk to the Assassins to complete the mission.