Easy Way to get Master of Disguise
For anyone who is having trouble getting Master of Disguise. the easiest mission ive found is the one where you have to kill the General in the Tank under the Arc de Triumphe. all you have to do is drive around to the back. and walk up to the back of the tank. there is fire surrounding the tank. and all the Nazi guards are in the back and front entrence. so you can't be seen through the fire. plant a thing of dynamite on the back of the tank. slowly Nazi walk away and boom. tank explodes. General dead. achievment yours.
Hope I help somebody.