User blog:KibolLP 97/Gold Medal Achievement/Trophy

Hello again, fellas, I have a next question for you and I hope you will answer me on this one this time. It's about Gold Medal Achievement/Trophy that I can't get even I did a few missions and I got for them a Gold Medal Rank, but trophy still is unlocked. May it be because of replaying missions in order to get it? Thanks in advance to you and see you in multiplayer.