Here is the full list of all 28 STEEL COMBAT trophies - there are 18 bronze, 1 silver, 8 gold and 1 platinum.
Acquire All Trophies
Clear Single Player Mode With Centurion
Clear Single Player Mode With Lock up
Clear Single Player Mode With Hydra
Clear Single Player Mode With Creed
Clear Single Player Mode With Chariot
Clear Single Player Mode With Mikazuki
Clear Single Player Mode With Wurtzite
Clear Single Player Mode With Plumeria
Clear Single Player HARD Mode With Centurion
Clear Single Player HARD Mode With Lock up
Clear Single Player HARD Mode With Hydra
Clear Single Player HARD Mode With Creed
Clear Single Player HARD Mode With Chariot
Clear Single Player HARD Mode With Mikazuki
Clear Single Player HARD Mode With Wurtzite
Clear Single Player HARD Mode With Plumeria
Clear Single Player VERY HARD Mode With Centurion
Clear Single Player VERY HARD Mode With Lock up
Clear Single Player VERY HARD Mode With Hydra
Clear Single Player VERY HARD Mode With Creed
Clear Single Player VERY HARD Mode With Chariot
Clear Single Player VERY HARD Mode With Mikazuki
Clear Single Player VERY HARD Mode With Wurtzite
Clear Single Player VERY HARD Mode With Plumeria
Play Single Player Mode
Play Multiplayer Mode
Play Training Mode