Here is the full list of all 48 How to Train Your Dragon trophies - there are 32 bronze, 13 silver, 2 gold and 1 platinum.
Get all trophies
Win a fight in either Story mode or 1 Player Arcade mode.
Finish the Story mode with Hiccup.
Finish the Story mode with Astrid.
Talk to every person on the island in Story mode.
Catch 200 chickens.
Catch 200 sheep or boars.
Win against the leader of the first Tournament.
Win against the leader of the second Tournament.
Win against the leader of the third Tournament.
Win against the leader of the fourth Tournament.
Win the first Tournament without being defeated.
Win the second Tournament without taking care of your dragons during it.
Win the third Tournament always fighting the lowest rated opponent.
Win the fourth Tournament always fighting the highest rated opponent.
Win the final Championship with none of your dragons being KO.
Make a dragon finish all trainings.
Win a wild fight.
Win all wild fights.
Spend 10,000 gold at the shop.
Buy all recipes from the shop.
Gather 1,000 common ingredients.
Gather 100 rare ingredients.
Have 4 dragons in a great shape in Story mode.
Have a level 25 dragon.
Have 4 level 25 dragons.
Unlock all legendary dragons.
Have a dragon with 20 points in a characteristic in Story mode.
Unlock all customizations of a dragon family.
Win 50 fights without being injured in 1 Player Arcade mode.
Win 100 fights in either 1 Player or 2 Players Arcade mode.
Win 10 fights in a row in 1 Player Arcade mode on Hard difficulty.
Win a fight with each default and Legendary dragons in 1 Player Arcade mode.
Win 20 fights in 1 Player Arcade mode with a team of dragons created with the Dragon Editor.
Win 20 fights in 1 Player Arcade mode with a team of custom dragons from the Story mode.
Win all the medals for all difficulty levels in each challenge.
Earn a gold medal in any challenge on Novice difficulty.
Earn a gold medal in any challenge on Normal difficulty.
Earn a gold medal in any challenge on Expert difficulty.
Clear 5 checkpoint rings in a row in the Looping Race challenge on Expert difficulty.
Sculpt 10 ice blocks in a row in the Ice Sculpting challenge on Expert difficulty.
Bring back 5 brown sheep in a row in the Flying Shepherd challenge on Expert difficulty.
Perform 6 sequences in a row in the Memory Torch challenge on Expert difficulty.
Recreate 3 dragons in a row without mistakes in the Puzzle Dragon challenge on Expert difficulty.
Earn a gold medal in each challenge.
Have 10,000 gold in Story mode.
Play more than 20 hours in Story or Arcade mode.
Import at least one dragon in Arcade mode.