Select Promotions from Extras menu, then activate the following cheast to unlock the corresponding fully-upgraded aliens:
CHEAT FUNCTION - CHEAT CODE
Gravattac - Feedback - Fourarms - Diamondhead - Bloxx
Wildvine - Gravattack - Eye Guy - Arctiguana - Wildmutt
XLR8 - Shocksquatch - Gravattack - Arctiguana - Diamondhead
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.
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.
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).
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.
Omniverse Overlord - Earn all Bronze, Silver, and Gold trophies.