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Medal were awarded for completing certain objectives. Rewards were given for gaining specific medals.
Medals were Items in Ratchet: Deadlocked obtained by completing the final challenge on a level that was not a dread challenge, only one was awarded on DreadZone Station in the Marauder Tournament, collecting Medals along with Dread points unlocked new levels and new Dreadzone Station Tournaments. There were a total of 10 medals in the game: 4 Green Medals, 2 Orange Medals, 2 Blue Medals and 2 Black Medals.
Ratchet & Clank: Full Frontal Assault
There are three medals to be gained on every level (apart from Zurgo's Lair of Doom which only has one) you gain medals by completing a level, having all six generators still active at the end of the level and for beating the challenge time on level.