Halo 3 achievment problem!!!!!???

[Game Master]

i killed 10 people without dying and didnt get the achievmet. What the Heck!!!!!!

 

[Bakkin99]

Killing Frenzy 5
Kill 10 enemies without dying in any ranked free for all playlist (Online).

Were you in a "Ranked" "Free For All" Playlist?
This is one of my favorite games

 

[Bakkin99]

Killing Frenzy 5
Kill 10 enemies without dying in any ranked free for all playlist (Online).

Were you in a "Ranked" "Free For All" Playlist?
This is one of my favorite games