Medals are achieved doing certain objectives in single player and multiplayer mode.

Effect	How to unlock
conqueror supreme	Win in every map
conqueror(bronze)	Win 5 battles
conqueror(gold)	Win 30 battles
conqueror(silver)	Win 15 battles
flag carrier (bronze)	Capture 5 flags
flag carrier (gold)	Capture 30 flags
flag carrier (silver)	Capture 15 flags
galactic overlord	Win the galactic conquest mode
hero vanquisher	Kill 10 heroes
Jedi Master (bronze)	Get 25 kills as a hero
Jedi Master (gold)	Get 150 kills as a hero
Jedi Master (silver)	Get 75 kills as a hero
multiplayer maverick (bronze)	Reach 50 kills online
multiplayer maverick (gold)	Reach 300 kills online
multiplayer maverick (silver)	Reach 150 kills online
Renegade leader	Complete the campaign
rogue leader(bronze)	Destroy 10 starfighters
super slicer	Slice 15 vehicles
Tank Buster(bronze)	Destroy 10 vehicles
Tank Buster(gold)	Destroy 50 vehicles
Tank Buster(silver)	Destroy 25 vehicles