I'll try to help the best I can with any tips or guiding towards achieving any specific medal. Since I have got all the medals myself, I can say that I feel confident helping anyone out how to do it.
First off all there are 3 steps of requirements.
Skill! Are you noob or just don't play that much. Then stop wasting your time...
The Medal-system is kind of **** (If it hasn't been a recent patch for it yet). The 5 weekly medals will be randomly obtainable and you need to cross your buttocks that you'll see the ones your after to appear. Be patient.
Some medals are really hard to get, don't get mad at the game or your counter-players for ruining everything for you. Beacuse they will!
Any other than that. Fire away!