Assassin is a medal achieved after killing 150 unaware enemies as a Ninja. This means that the player needs to kill them while their soldier is being invisible. That can be achieved by Chameleon trait, exclusive to Ninjas, which gives them invisibilty while they aren't close to enemies.
- The name of the medal might be a reference to an old class from Strike Force Heroes series named Assassin, which also used a power similar to Chameleon (Shadow blend). Snipers from Strike Force Heroes 2 and 3 are Assassin's successors.