Here is the full list of all 20 Alien Rage trophies - there are 20 bronze.
Complete single player campaign on any difficulty level
Complete single player campaign on Brutal difficulty
Defeat Vorus Centurion
Defeat Security Turrets
Defeat Vorus Gladiator
Defeat Mk XII Heavy Mech
Defeat AA-19 Combat Mech
Defeat GX-7 Destroyer Prototype
Defeat Vorus Primus
Defeat DF9 Sentry Mech
Defeat Vorus God Mech
Find a new weapon
Use all weapons
Unlock first Perk
Kill an enemy with every weapon
Defeat all Bosses
Find all weapons
1500 Total Kills
Unlock all player perks
Reach a player score of 25,000,000