Here is the full list of all 25 Omega Strike trophies - there are 9 bronze, 8 silver, 7 gold and 1 platinum.
Defeat Garbage Disposal Unit X13
Buy a Grand Feast
Defeat Colonel Gurtz
Defeat Overseer Brodus
Defeat the forest guardian
Find 10 Life Cubes
Open 10 chests
Defeat Drillmaster 5000
Defeat commander armstrong
Buy a Chicken Treat
Defeat Wrassled
Collect 100 coins
Buy a weapon upgrade
Defeat Dozer
Collect 50 coins
Open a chest
Find a Life Cube
Collect 10 coins
Unlock all trophies
Open all chests in one game
Collect all Life Cubes in one game
Defeat the sky commander
Defeat the Garbage King
Defeat OmegaBot-2000
Defeat Doctor Omega