After Burner Climax
12 Achievements
1-2h
Triple A
Got a AAA ranking in Arcade mode (for Shot Down, Combo, or Play Time).
30.7%
How to unlock the Triple A achievement in After Burner Climax - Definitive Guide
So with the extra speed, accuracy and extended combo time fly through the main game doing the best you can and you should have this achieve without any problems at all.
There are three objectives you have to fulfill in order to achieve a AAA ranking in Arcade mode, Shot Down, Combo and Play Time.
You only have to complete one of the goals in order for the trophy to unlock.
Here are the requirements:
Shot down: Shoot down more than 600 enemies during one playthrough of Arcade mode.
Combo: Achieve an average combo of 75.
Play Time: Finish Arcade mode in less than 9 minutes.
The easiest objective is the play time. All you have to do is to set the jet speed to "Fast" in the EX-Options once you've unlocked it and you will fly at full speed all the time. You will have no problems to finish the game in less than 9 minutes then.