Aragami

Before you can earn this trophy, you'll first need to unlock the 'Kunai' Shadow Technique. Once you've unlocked this, locate a guard armed with a bow (preferable from a good distance away) and attract their attention by walking into the path of their aiming indicator. This will trigger them to attempt to attack you. Now, equip the Kunai skill and once you see the guard firing an arrow towards you, throw a kunai towards them, while allowing yourself to be killed by the arrow - and you should earn this trophy.

Here's a video guide, courtesy of Trophy Germany: