Complete the following tasks to unlock PlayStation Vita trophy rewards.

Trophy	How to unlock
Back In The Line (Bronze)	Prestige the Game once.
Bang!! And The Zombies Are Gone! (Gold)	Prestige 20 times.
Barrel Of Laughs (Bronze)	Complete a level by only shooting Barrels.
Feel The Rush (Bronze)	Get a Platinum medal with a single bullet.
Flawless Victory (Bronze)	Finish the game getting the best ending.
Frying Tonight (Bronze)	Kill 5 other Zombies by shooting a Taser Zombie.
Happy Shopper (Bronze)	Get all Upgrades in a single category.
Line 'Em Up (Bronze)	Shoot a Cop Zombie and have their bullet kill five other Zombies.
No Stone Unturned... (Silver)	Complete the game to 100% (all Platinum medals).
Shopaholic (Silver)	Get all upgrades in all categories.
Sweeter Than Gold (Bronze)	Get a Platinum medal.
You Made It... Right? (Bronze)	Finish the game with any ending.