Repair 5 objects in Beach Head during one round

Use the Engineer's secondary ability to repair five of the broken down ammo caches in a match. When you have the repair ability chosen, you will see broken objects as white wrench icons on your radar. You cannot repair one object, destroy it, and then repair it again five times in a row for this trophy. You will have to wait until it is destroyed by someone on the other team before you can repair the same object again for credit towards the trophy. (You will need to have reached the online rank of Lieutenant to unlock the Engineer Badge, and then obtained the Defensive Specialist Medal in order to repair objects.

Play on the Helghast team when you go for this trophy (if you cannot pick your team, disable Faction Balancing in your custom game settings). There are two turrets at the Helghast spawn points that only they can reach; ISA players will be killed by bots if they try to reach them. Here's a video showing how to reach the turrets in this map, along with the ammo caches: