i don’t get why they would put medals in the game that we cant get, such as
Thriller (Medal)
Kill 15 humans as the zombie without dying.
These medals are possible in Custom Games if there is ONE Zombie off spawn and manages to kill all the players in the game.
It is not possible in Matchmaking and probably never will be.
Better to have it, but not need it than to want it, but not have it. Bungie wanted this game to cater to all extremes.