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