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