Here is the full list of all 46 The Seven Deadly Sins: Knights of Britannia trophies - there are 34 bronze, 8 silver, 3 gold and 1 platinum.
All trophies acquired. Congratulations!
Used Special Moves for all characters.
Created all Magic Items.
All combat-type Magic Items created.
All adventure-type Magic Items created.
Maxed out HP for all members of the Boar Hat crew.
Completed all quests in southern Liones.
Completed all quests with "S" rank.
Completed all quests.
Completed all quests in western Liones.
Completed all errand quests.
Completed all quests in northern Liones.
Completed all quests in eastern Liones.
Completed all quests in the capital city.
Completed all quests in central Liones.
Completed all side quests with "S" rank.
All Boar Hat abilities enhanced.
Completed all side quests.
Acquired 100% of Gossip Points for all of Liones.
Completed all main quests with "S" rank.
All Seven Deadly Sins assembled.
Escanor joined your team.
Unlocked all characters.
Found Magic Crystals on the field map 100 times.
Settled things with Zeldris.
Defeated Albion.
Merlin joined your team.
Defeated Hendrickson after he attained the Ash Demon's power.
Used 100 magic traps.
Settled things with Gilthunder.
Got a total of 100,000 Magic Crystals.
Gowther joined your team.
Acquired 100% of an area's Gossip Points.
Meliodas awakened his demon power.
King joined your team.
Landed a 30-hit combo.
Ban joined your team.
Won a battle with no damage.
Diane joined your team.
Fought with a Magic Item equipped.
Completed first side quest.
Explored the Britannian map for the first time.
Created a Magic Item.
Used a Special Move.
Landed a Co-Op Attack with a partner.
Quest "The Boar Hat" completed.