Here is the full list of all 36 Valkyria Chronicles 4 trophies - there are 20 bronze, 10 silver, 5 gold and 1 platinum.
Obtained all trophies.
Obtained all decorations.
Obtained all infantry weapons.
Triggered a Last Stand 15 times.
Obtained all tank parts.
Watched all event scenes.
Kept your promise with Riley Miller.
Obtained A ranks on all missions.
All of your classes were upgraded to max level.
Obtained all ship parts.
Recruited all squad members.
Defeated 1000 enemy units.
Gave ship orders 15 times.
One of your classes was promoted to Paragon status.
Completed Chapter 18, and ended Belgar's dark ambitions.
Rescued 10 allies in critical condition.
Completed Chapter 17, and witnessed the end of the war.
Learned all orders.
Completed Chapter 15, and defeated both Walz and Crymaria.
Gave direct commands 15 times.
Completed Chapter 11, and made it past the Sea Fortress.
Defeated 15 enemy aces.
Earned 1,000,000 DCT cumulatively.
Gave orders 15 times.
Developed the Hafen into a heavy tank.
Completed Chapter 7, and rendezvoused with the Centurion.
Obtained A ranks on 20 missions.
One of your classes was promoted to Elite status.
Completed Chapter 4, and won the battle of Siegval.
Completed a squad story for the first time.
Completed 10 missions without anyone in critical condition.
One of your squadmates was promoted to Corporal.
Used R&D Facility for the first time.
Learned an order at the Mess Hall for the first time.
Defeated an enemy ace for the first time.
Obtained an A rank on a mission for the first time.