Chain Master
Took down 5 hostiles in a row with an assault chain.

This trophy CANNOT be done in multiplayer. This is without question one of the hardest trophies in the game, but there are a few missions that you can get it with a bit of luck and patience. An assault chain is when you have an enemy plane in DFM and you destroy them, instead of the game going to the slow motion sequence, it then automatically locks onto another plane which is nearby.

However the one mission which seems to generate the most success is Blue on Blue. Select it from the free mission menu and set the difficulty to Rookie. Then pick the F-22 and make sure you have skills such as advanced machine gun/missiles and DFM enhancers etc.

After you abort the landing sequence at the start, head to the waypoint and lock onto the first red target. Enter DFM and just wait. Eventually a second plane will fly into view, at this point fire your missiles and machine guns, it should then lock onto the second plane... again... just keep it locked on and wait... a third plane should then appear. Destroy the one you have locked on (in DFM) and it should auto lock onto the next.

Be aware, that when the second wave of reds appear, they will try to get you into DFM, if this happens it will break your chain, if you still cant get it due to enemy planes locking on, try doing it with a plane that has the ECM special weapon, this will prevent enemy planes from locking onto you.