Completion bonuses
Successfully complete Campaign mode with any Ace Style on any difficulty setting to unlock the Music Player and Scene Viewer in the Ace Style Gallery.

Expert mode
Successfully complete the game on the Hard difficulty setting to unlock the Expert difficulty setting.

Free Mission mode
Successfully complete Campaign mode to replay any completed mission.

The Gauntlet
Defeat all mission required enemy Ace Squadrons to unlock The Gauntlet.

Bonus hangar
Get an "S" rank on all 55 missions in Campaign mode on the Ace difficulty setting to unlock a new hangar with Ustio and Galm team flags.

ADF-01 Falken
Have a saved game file from Ace Combat 4: Shattered Skies and Ace Combat 5: The Unsung War on your memory card to unlock the ADF-01 Falken for purchase in the hangar after Mission 1. Alternately, have a saved game file from Ace Combat 5: The Unsung War on your memory card. Then, successfully complete Campaign mode with all three Ace Styles on any difficulty setting. Alternately, get the Supreme Mercenary, Supreme Soldier, and Supreme Knight medals. Successfully complete Campaign mode on the Ace difficulty setting to unlock the SP color scheme for the ADF-01 Falken.

X-02
Have a saved game file from Ace Combat 4: Shattered Skies and Ace Combat 5: The Unsung War on your memory card to unlock the X-02 for purchase in the hangar after Mission 1. Alternately, successfully complete Campaign mode twice with a different Ace Style each time to unlock the X-02. Successfully complete Campaign mode on the Hard difficulty setting to unlock the SP color scheme for the X-02.

A-10A
Shoot down the A-10A Fischer in Mission 5 to unlock the A-10A and its SP color scheme.

ADFX-01
Successfully complete Campaign mode with all three Ace Styles on any difficulty setting to unlock the ADFX-01. Successfully complete Campaign mode on the Expert difficulty setting to unlock the SP color scheme for the ADFX-01.

EA-6B
Successfully complete Mission 6 to unlock the EA-6B. Shoot down the EA-6B Bergnebel in Mission 9 on the Ace difficulty setting to unlock the SP color scheme for the EA-6B.

EA-18G
Successfully complete Mission 14C to unlock the EA-18G. Shoot down the EA-18G Wolkenwand in Mission 11 to unlock the SP color scheme for the EA-18G.

F-1 SP color scheme
Shoot down the F-1A Biene in Mission 8A to unlock the SP color scheme for the F-1.

F-2A
Successfully complete Mission 8A to unlock the F-2A. Shoot down the F-2A Strom in Mission 8A on the Ace difficulty setting to unlock the SP color scheme for the F-2A.

F-4E
Shoot down the Silber 1 in Mission 10 in Knight Ace Style to unlock the F-4E and its SP color scheme.

F-5E SP color scheme
Shoot down the F-5E Tiger in Mission 1 to unlock the SP color scheme for the F-5E.

F-14D
Shoot down the Schnee Squadron in Mission 10 in Soldier Ace Style to unlock the F-14D and its SP color scheme.

F-15C
Successfully complete Mission 9 in the Mercenary Path to unlock the F-15C. Shoot down the F-15C Mondlicht in Mission 13 to unlock the SP color scheme for the F-15C.

F-15C (Pixy Solo Wing)
Successfully complete Campaign mode on the Expert difficulty setting to unlock the F-15C (Pixy Solo Wing).

F-15E
Successfully complete Mission 12 in the Mercenary Path to unlock the F-15E. Shoot down the F-15E Albatros in Mission 14B on the Expert difficulty setting to unlock the SP color scheme for the F-15E.

F-15S/MTD
Shoot down the Socerer Squadron in Mission 16 in Mercenary Ace Style to unlock the F-15S/MTD and its SP color scheme.

F-16C
Successfully complete Mission 4C to unlock the F-16C. Shoot down the Silber Squadron (2-5) in Mission 10 in Knight Ace Style to unlock the SP color scheme for the F-16C.

F-16XL
Shoot down the Wizard Squadron in Mission 16 in Knight Ace Style to unlock the F-16XL and its SP color scheme.

F/A-18C
Shoot down the Grun Squadron in Mission 3 in Soldier Ace Style to unlock the F/A-18C and its SP color scheme.

F-117A
Successfully complete Mission 14A to unlock the F-117A.

F-20A
Successfully complete Mission 4B to unlock the F-20A. Shoot down the F-20A Falter in Mission 8B to unlock the SP color scheme for the F-20A.

F/A-22
Successfully complete Campaign mode in any Ace Style and on any difficulty setting to unlock the F/A-22. Shoot down the F/A-22A Ritter in Mission 17 to unlock the SP color scheme for the F/A-22.

F-35C
Successfully complete Mission 14B to unlock the F-35C. Shoot down the F-35C Moewe in Mission 4B on the Ace difficulty setting to unlock the SP color scheme for the F-35C.

J-35J SP color scheme
Shoot down the Espada 1 in Mission 15 to unlock the SP color scheme for the J-35J.

MiG-21 bis SP color scheme
Shoot down the MiG-21 bis Huckebein (Pops) in Mission 10 to unlock the SP color scheme for the MiG-21 bis.

MiG-29A
Successfully complete Mission 4A to unlock the MiG-29A. Shoot down the MiG-29A Flamingo in Mission 8C to unlock the SP color scheme for the MiG-29A.

MiG-31
Shoot down the Schwarze Squadron in Mission 10 in Mercenary Ace Style to unlock the MiG-31 and its SP color scheme.

Mirage 2000
Successfully complete Mission 5 to unlock the Mirage 2000. Shoot down the Mirage 2000D Wuerfel in Mission 2 to unlock the SP color scheme for the Mirage 2000.

Rafale M
Shoot down the Espada 2 in Mission 15 to unlock the Rafale M and its SP color scheme.

Su-27
Successfully complete Mission 9 to unlock the Su-27. Shoot down the Su-27 Postler 1 and 2 in Mission 4C on the Ace difficulty setting to unlock the SP color scheme for the Su-27.

Su-32
Successfully complete Mission 12 to unlock the Su-32. Shoot down the Su-32 Humie in Mission 7 on the Ace difficulty setting to unlock the SP color scheme for the Su-32.

Su-37
Shoot down the Gelb Squadron in Mission 6 to unlock the Su-37 and its SP color scheme.

Su-47
Shoot down the Gault Squadron in Mission 16 in Soldier Ace Style to unlock the Su-47 and its SP color scheme.

TND Gr.4
Successfully complete Mission 8B to unlock the TND Gr.4. Shoot down the TND Gr.4 Weihe in Mission 14 to unlock the SP color scheme for the TND Gr.4.

Typhoon
Shoot down the Rot Squadron in Mission 3 in Mercenary Ace Style to unlock the Typhoon and its SP color scheme.

X-29A
Successfully complete Mission 8C to unlock the X-29A. Shoot down the X-29A Hundert in Mission 4A on the Ace difficulty setting to unlock the SP color scheme for the X-29A.

YF-23A
Shoot down the Wizard Squadron in Mission 16 in Knight Ace Style to unlock the YF-23A and its SP color scheme.

Knight color scheme
Successfully complete Campaign mode in Knight Ace Style to unlock the Knight color scheme for all aircraft.

Mercenary color scheme
Successfully complete Campaign mode in Mercenary Ace Style to unlock the Mercenary color scheme for all aircraft.

Soldier color scheme
Successfully complete Campaign mode in Soldier Ace Style to unlock the Soldier color scheme for all aircraft.

Medals
Successfully complete the indicated task to unlock the corresponding medal:

Deliverance Bell: Successfully complete Mission 6.
Guardian: Successfully complete Mission 8.
Broken Sword: Successfully complete Mission 9.
Ragnarok: Get an "S" rank in Mission 15.
The Gold Of Annwn: Destroy all enemy units positioned at Avalon Dam in Mission 17. Note: Destruction of the units at the ravine is not required.
Bronze Ace: Destroy 200 enemy planes.
Silver Ace: Destroy 500 enemy planes.
Gold Ace: Destroy 1,000 enemy planes.
Marksman: Destroy 5 enemy planes using machine guns.
Sharpshooter: Destroy 15 enemy planes using machine guns.
Expert Marksman: Destroy 50 enemy planes using machine guns.
Knight Ace: Successfully complete Campaign mode in Knight Ace Style.
Mercenary Ace: Successfully complete Campaign mode in Mercenary Ace Style.
Soldier Ace: Successfully complete Campaign mode in Soldier Ace Style.
Supreme Mercenary: Successfully complete Campaign mode with the style meter at the left-most end of the style gauge.
Supreme Soldier: Successfully complete Campaign mode with the style meter at the center of the style gauge (directly over the letter "d" of "Soldier").
Supreme Knight: Successfully complete Campaign mode with the style meter at the right-most end of the style gauge.
Bronze Wing: Get an "S" rank in all missions on the Normal difficulty setting.
Silver Wing: Get an "S" rank in all missions on the Hard difficulty setting.
Gold Wing: Get an "S" rank in all missions on the Expert difficulty setting.
Mobius 1 dogfight
In the Gauntlet mission, defeat the fourth squadron, Espada, in less than a minute for there to be an extra aircraft in the next fight, Mobius 1. Mobius will immediatly shoot down all the other aircraft with a barrage of missiles (unless you manage to destroy them first). You will then have a one-on-one dogfight with Mobius. He will fire a barrage of missiles in your direction from any angle. Note: This only works on the Ace difficulty setting.

Fly as Mobius 1, Yellow 13, or Razgriz
The soldier paint scheme for the F/A-22A Raptor is Mobius 1's from Ace Combat 4: Shattered Skies, including the I.S.A.F Ribbon insignia on the tail. The mercenary scheme for the Su-37 Terminator is Yellow 13's colors from Ace Combat 4: Shattered Skies. It even changes the aircraft number from 032 to 013. The soldier scheme for the F-14D Super Tomcat is Razgriz's from Ace Combat 5: The Unsung War, also including an insignia change to match.

Destroying the XB-O
To destroy the XB-O (super bomber) faster, use a plane that can support a FAEB (fuel-air explosive bomb) such as the Su-37 Terminator. Fly close over the XB-O, fire the FAEB, and pull up. Repeat this until you must destroy the Espadas. Then, fire two missiles into the front of the XB-O. Note: You cannot destroy the super ship until you destroy the Espadas.

Wolfgang Buchner quote
Get all "S" ranks on the Ace difficulty setting to get a quote from "Wolfgang Buchner", also known as "Huckebein the Raven", "Pops", and "Special Forces Second Lieutenant Peter N. Beagle." This quote is as follows:

"Eclipsing power is, at times, not only the instrument of demons, but also of gods."
--Wolfgang Buchner--
Ace Combat 5 reference
When you return to the round table for the second time, run down every allied fighter on the Mercenary Path. You will eventually find a fighter named "hrtbrk1" (Jack Bartlett), from Ace Combat 5: The Unsung War.