For the True Friendship achievement, I did it this way.
Go into Practice with your teams, then go to Advanced Settings, then to Rage. Set the rage on for both you and your partner. Next, go to Mode Select, then VS. CPU Training. Crank up the difficulty to Ultra Hard and then exit out of the menu and resume gameplay. You do this correctly and not only should both meters be flashing red, but the AI should be attacking you aggressively. Once they hit you on the ground, quickly hit Y+RB and a Tag Crash should happen. Do it two more and that's all she wrote!