Air Conflicts: Secret Wars

As the trophy description suggests, you must shoot down 10 players in a single multiplayer match without dying. This trophy can be done in any game type, so playing in one without a kill/time limit is recommended. Suggested method: Host a game, and set the type to Capture the Flag, teams to Great War and set a score limit. I'd recommend doing this in conjunction with Great War. While the WWI planes in the Great War teams are slow, they are also easy to shoot down so kills should come on a 'whoever shoots first' basis. If you shoot an enemy down near their base, they tend to respawn in one location which makes killing them again easier. Using this method will also unlock Blue Max.