From i've gathered
Clearing Campaign on Any difficulty Gives you the following:
Paint Scheme Mod
2nd Skins via completing campaign
3rd Skins can be unlocked in MP via points
When unlocked, they may unlock the respective ace's scheme
Alpha - Default
Scarface- Earn Ace Pilot Bonus
Mobius- Earn Hero Bonus
Wardog- Earn Ace Striker Bonus 5 times
Galm- Earn Ace Pilot Bonus 5 times
Gryphus- Earn hero Bonus 5 times
Garuda- Complete the campaign
Falco- Earn the Ace Striker Bonus
Antares- Earn 1,000,000 points
Strigon- Earn Survivor bonus 5 times
Aquila- Earn Survivor bonus
Gator- Use ASM support more than 50 times
Phoenix- Place first in a Deathmatch
Rex- Use ASM support more than 100 times
Assault- Use DFM support more than 100 times
Ghost- Use an attack helicopter to shoot down more than 100 enemy players in competitive online
Cougar- Shoot down more than 100 enemy players
Dragon- Win 10 Capital Conquest matches
Renegade- Obtain 300,000 points
Sweeper- Shoot down more than 50 enemy players in an attack helicopter in competitive online
Viking- Obtain 20,000 points
Burner- Get 20 Capital Conquest wins
Wildcat- Shoot down more than 50 enemy players
Mohawk- Obtain a total of 100,000 points
Stingray- Get 10 Domination wins
Titan- Earn 600,000 points
Racer- Use DFM support more than 50 times
Also, unlocked Antares's paintscheme.
Ace Pilot is getting the most number of air kills in a round,
Ace Striker is getting the most number of ground kills in a round,
Survivor is staying alive the longest,
Hero is performing the overall best in a round.
Unlocked by unlocking about 28 skills.
Long-Range Rocket Launcher
Enhanced Direct Shot
Quick Base Capture
Also, there are still 2 skills that are unlocked by unlocking skills, they are 72 and 73 on the Unlockables list in-game.
Extra Missiles+ (Oil Field) Increases missile capacity, sacrifices firepower.
Enchanced Rocket Launcher + (East African Town) Increases rocket firepower, decreases aircraft durability.
Quick Turn + (Dubai) Increases turning performance *NO negative effects.*
Extra Bombs + (Derbent) Increases bomb capacity, sacrifices firepower.
Throttle Boost + (ICBM Base) Increases acceleration performance, decreases ammunition capacity.
Extra Rocket Launcher + (Central Moscow) Increases rocket capacity, sacrifices firepower.
Extra Armor + (Moscow) Extra armor, decreases firepower.
Double Assault (Miami) Charges assault circle twice as fast and increases its power *NO negative effects.*
Wide Range MG - Allows machine gun shots to scatter, makes it easier to hit enemies
Extra MGP - Increases capacity of MGP
Enhanced Missiles + - Increases missile firepower, decreases durability
Global ASM - Initiate ASM against ground targets at will
2nd paints: Clear campaign
3rd: use the aircraft that you want for online, unlocks paint after 10+ kills
Legacy: Earn the Hero MVP Aircraft Color: F-22A Raptor Color 4ISAF/Mobius One skin from AC04
Earn 5 Ace Pilot MVPsAircraft Color: F-15C Eagle Color 4Cipher skin from ACZ
Earn Survivor MVP 5 timesAircraft Color: Su-33 Flanker-D Color 4Ilya Pasternak/Strigon Team skin from AC6
Earn 5 Ace Striker MVPsAircraft Color: F-14D Super Tomcat Color 4Razgriz skin from AC5
Complete CampaignAircraft Color F-15E Strike Eagle Color 4Emmeria AF/Garuda Skin from AC6
Earn 1,000,000 points Color F-22A Raptor Color 5 Antares Skin
Earn 5 Ace Pilot MVPsAircraft Color: F-15C Eagle Color 5Solo Wing Pixy Skin from ACZ
Earn a certain number of points while piloting F-14D Super Tomcat (competitive online)Aircraft Color: F-14D Color 5"Sakura" or "Cherryblossom" color - see http://imgur.com/AGIpe for a (bad) photo
Edited by Mael Radec, 30 October 2011 - 12:30 PM.