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