Visuals
A special group of aircraft carrier color schemes called the Estovokian scheme will appear after players beat Ace Combat 6 on the Normal difficulty setting. A special Gamerpic also shows up once players beat the game on Ace difficulty.
Extras
Some modes and features in Ace Combat 6 are not readily available from the start of the game. To get Ace Mode, the highest level of difficulty, players must beat the game's campaign on Expert difficulty. Beating the entire game one time will let players have a music player, scene viewer, and the Expert difficulty level.
The CFA 44 Nosferatu Fighter plane can be earned by besting the game on Hard difficulty. While the Nosferatu Fighter will appear after accomplishing this, it must still be purchased for a total of $229,500. To earn the SP New Game, players must complete Ace Combat 6's campaign on any of the difficulty levels.
Planes
Many of the planes in Ace Combat 6 must be earned by completing specific missions on Normal difficulty. Once mission four is finished, the A-10 Thunderbolt and Mirage 2000 become available. Finishing mission five will unveil the Panavia Tornado, while completing mission six earns the F-14D Tomcat and the FA-18 Super Hornet. After besting mission eight, players get the Sukhoi 33 Flanker, while they get the F-15E Strike Eagle and Rafale M after mission nine. The F-117 Nighthawk is given after finishing mission 10, and the EU Typhoon shows up following mission 12. After mission 13, players get the F22A Raptor and the Sukhoi 47 Berkut.
Achievements
Ace Combat 6 features a number of achievements that players can earn by completing certain tasks. Once every medal in the game is earned, the All Medals achievement is given. Finishing every operation in Ace Combat 6 earns the All Operations achievement, while killing 100 enemies with electronic support gets the Electronic Support System award. Winning Battle Royale matches in increments of 10, 30, 50, and 100 will unlock different Battle Royale achievements. Defeating aircraft opponents online will earn achievements as well, as shooting down 50, 100, and 200 enemies unlocks different Online Kills achievements.