assault trooper achievement

[bonsaimaster]

on call of duty
how do you get the assult trooper achievement ive tryed everymission with every gun but dont know how to get it

[Nik315]

You have to complete a mission firing only assault rifles and NO melee attacks

[Mattk]

if you select the achievement it tells you what you need to do

[DC_FC]

each of the weapons are in different classes, i think the bar is an automatic weapon