Resistance: Burning Skies

This option first appears in the single player menu, after you have completed the single player campaign. New Game + will allow you to carry over your unlocked weapons, each upgrade you've unlocked, and any unused Grey Tech cubes you have found.

After completing this single player campaign, this difficulty become available when you start a new game.

Successfully complete single player mode.

Complete the following tasks to unlock PlayStation Vita trophy rewards.
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Platinum (Platinum): Earn all trophies.

Staten Island (Bronze): Successfully complete level 1.

Military Ocean Terminal (Bronze): Successfully complete level 2.

George Washington Bridge (Bronze): Successfully complete level 3.

Ellis Island (Bronze): Successfully complete level 4.

Protection Camp (Bronze): Successfully complete level 5.

Conversion Tower (Bronze): Successfully complete level 6.

Upgrade (Bronze): Upgrade a weapon in the Single Player Campaign.

Combine (Silver): Upgrade both slots of a weapon in the Single Player Campaign.

Customize (Gold): Upgrade all weapons in the Single Player Campaign.

Indiscriminate (Bronze): Kill an enemy with every weapon in the Single Player Campaign.

Variety (Bronze): Use the secondary fire of each weapon in the Single Player Campaign.

Dangerous (Bronze): Kill 250 Chimera in the Single Player Campaign.

Deadly (Silver): Kill 500 Chimera in the Single Player Campaign.

Lethal (Gold): Kill 1000 Chimera in the Single Player Campaign.

Axed (Silver): Kill 50 Chimera with Riley's axe in the Single Player Campaign.

Overheat (Silver): Kill 50 Chimera by detonating their heatstacks in the Single Player Campaign.

Boom (Silver): Kill 100 Chimera with headshots in the Single Player Campaign.

Impaled (Silver): Kill an Impaler.

Executed (Silver): Kill an Executioner.

Giant (Gold): Kill any combination of 18 Impalers or Executioners.

Incite (Gold): Complete one round of multiplayer.

Additionally there are three secret trophies.

G-man (Gold): Kill Gorrell.

Unnatural (Gold): Kill the Abomination.

Inhuman (Gold): Kill the Leviathan.