There are 47 Trophies that can be collected.

BRONZE

Open Season
Open 75 Tech Repositories over the course of the game.

Focused Destruction
Destroy 8 crates in a single attack.

15-Hitter
Perform a 15-hit combo.

25-Hitter
Perform a 25-hit combo.

Up In The Air
Defeat 30 enemies while they are in the air.

Human Power
Defeat 20 enemies as Young Ben or Teen Ben (not in alien form).

Omni What?
Defeat 30 enemies as Young Ben or Teen Ben (not in alien form).

Feedback Frenzy
Defeat 50 enemies as Feedback.

Think Fast
Defeat 50 enemies as XLR8.

The Eyes Have It
Defeat 50 enemies as Eye Guy.

Shockingly Effective
Defeat 50 enemies as Shocksquatch.

Gravattacktics
Defeat 50 enemies as Gravattack.

Battle Bloxx
Defeat 50 enemies as Bloxx.

Four Times The Fun
Defeat 50 enemies as Four Arms.

Cannon Fodder
Defeat 50 enemies as Cannonbolt.

Diamond In The Rough
Defeat 50 enemies as Diamondhead.

Branching Out
Defeat 50 enemies as Wildvine.

Heated Exchange
Defeat 50 enemies as Heatblast.

Goin' Mutts
Defeat 50 enemies as Wild Mutt.

Just Chillin'
Defeat 50 enemies as Arctiguana.

Not A Scratch
Complete an entire level without being defeated and reset.

It's Hero Time
Complete the entire game on Hero difficulty.

SILVER

Plumber Power
Fully upgrade all of Rook's Proto-Tool functions.

35-Hitter
Perform a 35-hit combo.

Look, Grandpa--No Aliens!
Defeat 50 enemies as Young Ben or Teen Ben (not in alien form).

GOLD

Smoothie Operator
Collect all Smoothie power-ups.

Codon Collector
Collect all Codon Crystal power-ups.

Omnitrix To The Max
Fully upgrade all of Ben's alien forms.

Mass Destruction
Destroy 150 crates in the game.

PLATINUM

Omniverse Overlord
Earn every Trophy in the game

17 SECRET

BRONZE

Training Time
Completed the training simulation… and wrecked the timeline.

The Galvanic Butterfly Effect
Escape from Malware… for now.

Future Malformed
Defeat Mucillator.

Technical Difficulties
Take out Psyphon and rescue Blukic and Driba.

Past Due
Defeat the Queen Ant and rescue Grandpa Max.

Extreme Earth Makeover
Discover the morphic generator.

That Was Then…
Plant the explosives in the past.

…This Is Now
Set off the explosives in the present.

Weird Scientist
Steal Animo's tech and lure Malware to the cavern.

Plumb Crazy
Lure Malware into the Plumber Training Room.

Two Malwares… No Waiting
Defeat both Malwares and fix the timeline.

Muttin' To It
Unlock Wildmutt.

Have A Ball
Unlock Cannonbolt.

Constructive Feedback
Unlock Feedback.

Heavy Duty
Unlock Gravattack.

Building Bloxx
Unlock Bloxx.

Super Cool
Unlock Arctiguana.

http://www.ps3trophies.org/game/ben-10-omniverse/trophies/