Here is the full list of all 12 Black Knight Sword trophies - there are 7 bronze, 4 silver and 1 gold.
Read every tutorial board
Clear stage 1
Use a magic attack on the bread.
Game over, 50 times over
Clear stage 5
Finish the game in hard mode
Finish the game without ever entering the shop
Finish the game without dying
Clear Arcade Mode
Finish every mission in challenge mode
Collect all the cat head grass in story mode
Watch the end credits