This is done in Episode 6: Japan. To begin, obtain the director's disguise and head to the kitchen. Once in the kitchen, take out the two chefs, steal a chef disguise and use the knife to get poison from the fugu fish in the walk in refrigerator. Head up to the sushi station and prepare the sushi, do not serve it to anyone except the target. After poisoning Yamazuki, head back to the kitchen and get the director's disguise and head up to the mainframe. Cause the mainframe to reboot and then remove the parts in the order shown on the mainframe reboot screen. Finally, access the computer outside of the mainframe room to kill Soders for your achievement / trophy.
Here is a video guide with English commentary for this achievement!
Here is a playlist of guides for this game!
https://www.youtube.com/playlist?list=PL-HeW6XkKdUK9Qh-6TvL3...