How to get Medals? Read the following cheats and ou will be able to get them easily!
Land Guardian: keep minimum allied casualties at Stand Canyon
Bronze Ace: kill 200 enemies
Gold Ace: kill 1,000 enemies
Mark of the Vioarr: defeat the Fefnir
Sea Guardian: keep minimum damage to the allied fleet at Terminus Island
Eye of the Storm: defeat the Gleipnir
Freedom Tower: liberate Griswall
Sharpshooter: destroy 15 aircraft with guns
Silver Ace: kill 500 enemies
Marksman: destroy 5 aircraft with guns
Expert Marksman: destroy 50 aircraft with guns