Tom Clancy's H.A.W.X. 2

This one is easy to earn in a normal Team Battle game, making sure you have 2 key ingredients - a lot of players, and normal player XP (meaning you can take more damage than realistic XP mode). Just play normally until you notice your team mates and yourself have all taken a bit of damage, then activate the repair drones. You and your team mates will subsequently get repaired gradually by the drones. If you have met the requirements the trophy will pop.

It helps here if there are the maximum 4 players on your team, meaning you will only have to repair 22.5 hp on each team member - just wait until each player is dipping to around the 50-70% mark and it will come easily.

Of course, this is another trophy that can be boosted easily - just have a lone player damage you and a team mate to around 40-50% each then repair away.