The Assassin is a special kill medal that is featured throughout the whole Halo trilogy, from Halo 2 to Halo Reach.
Related ThreadsDetailed Rogue Specialization Quest Walkthrough Videos (Artificer, Assassin & Tempest) - last post by @ Jan 27, 2015
Mark Of The Assassin DLC - last post by @ Jan 8, 2012
Stuck at random assassin ambush encounter. Can't beat them!! - last post @ Aug 20, 2015
Mark of the Assassin DLC Help!! - last post by @ Mar 20, 2012