Here is the full list of all 37 Fallen Knight trophies - there are 18 bronze, 14 silver, 4 gold and 1 platinum.
All trophies obtained. Congratulations!
Defeat an enemy
Disarm an enemy
Consecutively retry five times
Simultaneously destroy five enemies with Wrath of God
Customize a Lancelot skill
Deflect an attack
Activate Soar to Heaven
Activate Part the Sea
Activate Earth Carving
Activate Wrath of God
Find a hidden HP UP
Disarm a boss
Use Wrath of God against Wrath of Lucifer
Spend an honor point
Defeat a Condor
Escape from the falling elevator
Get hit by Whisper's sniper
Defeat 50 enemies
Disarm 50 enemies
Heal yourself
Purchase all items from the shop
Disarm Lucifer
Kill Lucifer
Disarm Strike
Disarm Whisper
Disarm Nikolai
Disarm Pierrot
Defeat 100 enemies
Disarm 100 enemies
Receive Excalibur
Obtain 100% in the Archives
Achieve your first Legendary Knight Rank
Achieve your first Knight Rank
Choose to stop Lucifer
Choose to let Lucifer reveal the truth
Complete the tutorial