There are 30 Trophies that can be earned in this title.

Bronze

First of Many
Pick up a 1st Down in a single palyer Exhibition or League game.

Paydirt
Score a Touchdown in a single player Exhibition or League game.

Armed and Dangerous
Stiff arm an opposing player in a single player Exhibition or League game.

A Spin Around the Block
Spin around an opposing player in a single player Exhibition or League game.

The Last Gasp
Convert a 4th down in single player Exhibition or League game.

Stealing the Feeling
Intercept the ball in a single player Exhibition or League game, without player switching.

From the Hurt, to the Dirt
Tackle the ball carrier in a single player Exhibition or League game, without player switching.

Quarter Pounder
Sack the Quarterback in a single player Exhibition or League game, without player switching.

In the Bag
Win a single player Exhibition or League game.

Swaggerlicious
Showboat 25 yards towards your opponent's endzone in a single player Exhibition or League game.

Hustle and Muscle
Perform a x5 combo in a single player Tackle Alley game.

Invincible
Perform a x5 streak in a single player Tackle Alley game.

Create and Dominate
Take a custom team online.

Silver

Boys to Men
Successfully complete all of the drills in Training Camp.

Moving the Chains
Pick up 500 offensive yards in a single player Exhibition or League game.

Good Eye, Strong Arm, Safe Hands
Throw 10 complete passes in a single player Exhibition or League game.

Quarter Pounder, with Cheese
Sack the Quarterback 3 times in a single player Exhibition

To the Hizzy
Score a defensive touchdown in a single player Exhibition or League game, without player switching.

Shut Out
Win a single player Exhibition or League game without your opponent scoring.

On the Up
Win the 16 team league in Season mode.

Big Fish, Small Pond
Win the 8 team league in Season mode

Half Wave There
Reach Wave 50 in a single player Tackle Alley game.

Something from Nothing
Create a Custom Team.

Head to Head
Win an online Exhibition game.

Gold

Season Finale
Win the 32 team league Season mode.

Flawless
Complete a season undefeated in Season Mode.

End of the Road
Complete Road to Backbreaker.

Parting Wave
Complete the final wave in a single player Tackle Alley game.

Online, On Form
Win 20 online Exhibition games.

Platinum

Platinum Trophy
Win all Bronze, Silver, and Gold Trophies.

http://www.ps3trophies.org/game/backbreaker/trophies/