User blog:Myronbeg/All Pro issue

The trivia for this sentence is completely nonsense:

The title "All Pro" does not require 2 headshots with a single bullet. The challenge can be completed if at least one of the kills is a headshot.

http://callofduty.wikia.com/wiki/Callsigns#Trivia

I have used SPAS-12 in the Hardcore Team Deathmatch to shoot with this style for 2 times, one in Terminal, the other at Wasteland. Yet, this so-called challenge glitch cannot succeed giving the title. Can somebody please investigate what is the rules or any restriction???