Complete the following tasks to unlock PlayStation3 trophy rewards.

Trophy	How to unlock
25% Gold Collectibles Found (Bronze)	Collect 25% of all Gold Collectibles.
50% Gold Collectibles Found (Bronze)	Collect 50% of all Gold Collectibles.
100% Gold Collectibles Found (Silver)	Collect 100% of all Gold Collectibles.
Pack Rat (Bronze)	Collect all upgrades.
Bowling (Bronze)	Kill an enemy with an object shot with G-Lifter.
Kiss Me Deadly (Bronze)	Kill a human enemy with another enemy's body.
Unfriendly Fire (Bronze)	Kill a human enemy with deflected bullets.
Death from Above (Bronze)	Kill an enemy by falling on him.
Electrifried (Bronze)	Electrocute a human enemy.
Second Amendment (Bronze)	Kill 100 enemies using the Rock Blaster.
Death on Delivery (Bronze)	Kill 100 enemies using objects shot or dropped with G-Lifter.
Say Hello to My Little Friend (Silver)	Kill 2 or more enemies with a single exploding mechanical enemy.
Game Completed (Bronze)	Defeat Maximillian.
Speed Run (Gold)	Complete the game in 3 hours or less.