Here is the full list of all 12 Yu-Gi-Oh! 5D's Decade Duels trophies - there are 8 bronze, 3 silver and 1 gold.
Defeat Yusei
Win a Preliminary Tournament
Win and get a Rare Card
Play a single player game
Defeat Jack
Save an original Deck Recipe
Play a Tag Duel
Win a Tag Duel for the first time
Inflict at least 1 million total damage
100 wins in Single Mode
100 wins in Tag Duel
200 wins in any mode