Assassin's Creed II

Assassinations are available as early as DNA Sequence 5. You can locate them on your map by pinpointing a icon. There are 30 Assassination events available to you throughout the game. Completing just one will unlock this achievement.

The first available assassination mission in Florence is called ‘Day at the Market’. At the very beginning of DNA Sequence 5, after the cutscene where you speak with Lorenzo, you are able to go on assassination missions. Before going to the first Memory Start icon, open the map and find the icon near where you are located. Ascend towards the icon and your destination will be a pigeon coop. Press to interact with it and Ezio will extract a piece of paper from the pigeon notifying him of his target. Accept the mission and go to the area where the target is (first highlighted by a yellow crosshairs). When you reach the general area, you will have to use your Eagle Vision to locate your target (hold ). He will glow yellow. Once you have found him, walk up and assassinate him.

Thanks to G4MERM4NIACO for the video: