Here is the full list of all 11 Invincible Knight trophies - there are 6 bronze, 4 silver and 1 gold.
Finish the first stage.
Defeat the Legatus in Stage 2.
Kill 10000 enemies.
Complete the game under any difficulty setting.
Achieve EXCELLENT BOOST 100 times.
Perform a 6 CHAIN STRIKING.
Complete the game at the hardest difficulty setting.
COUNTER 100 times.
Finish a stage with the remaining time less then one second.
Jump to dodge the Dark Eques's scythe attack ten times in a row.
Get S rank in all difficulties and stages.