Here is the full list of all 12 Top Gun achievements.
Mission 4 (1st playthrough – Viper wins).
First plane locked onto with missiles when in CFI and then successfully killed.
Jester is shot down at any point by either you or your wingman.
Awarded after 3 afterburner boosts.
Mission 4 (2nd playthrough – Player wins).
Complete all the Indian Ocean Missions.
Complete all of Prologue, Top Gun Academy and Indian Ocean with all planes (any difficulty).
Complete any one of three hidden flight runs.
Complete all 3 of the hidden runs.
99 kills in Multiplayer (with Missiles or Guns).
Rewarded for more than 10 gratuitous deaths in a single multiplayer match.
Be the first to get the star in a multiplayer match, and hold on to it until the bitter end.