You can easily obtain this on the Bryce canyon mission. You will be sent to look for X-Ray squad. You will find them, then watch the spinners get to them.
In the room with the cocoons there will be a Wraith in the middle of them. Pick it up but don't use it quite yet! Progress through the mission a bit and you will see two random spec ops guys that are going to get molested by tons of leapers. All you have to do is to deploy your shield (you can deploy the Wraith’s shield by pressing R2) and kill all the incoming leapers.
There is a conveniently placed cliff nearby. Drop down, rinse and repeat until Trophy is unlocked!