Here is the full list of all 21 Super Hydorah trophies - there are 5 bronze, 7 silver, 8 gold and 1 platinum.
Get all trophies!
Destroy Hydorah.
Destroy Hydorah and all his seeds.
Destroy Hydorah and all his seeds using no continues.
Find all hidden secrets in the game.
Complete a mission with an accumulated score of 500000 points or more.
Complete a mission with an accumulated score of 450000 points or more.
Complete a mission with an accumulated score of 400000 points or more.
Find the chest of Grialia.
Complete a mission with an accumulated score of 350000 points or more.
Complete a mission with an accumulated score of 300000 points or more.
Find a pink elephant.
Find a floating blue stone.
Complete a mission with an accumulated score of 250000 points or more.
Find a giant green egg.
Complete a mission with an accumulated score of 200000 points or more.
Complete a mission with an accumulated score of 150000 points or more.
Find a jumping flower.
Complete a mission with an accumulated score of 100000 points or more.
Complete a mission with an accumulated score of 50000 points or more.
Find an escaping astronaut.