Here is the full list of all 30 SoulCalibur II HD Online trophies - there are 14 bronze, 10 silver, 5 gold and 1 platinum.
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Victorious in Sudden Death
Obtained All Weapons in Weapon Master
Unlock All Characters
Ten Thousand Hits
Became Lv 72 "Iron Edgemaster" in Weapon Master
Acquired Soul Calibur in Weapon Master
Ten Victories in Extra Survival Death Match
Acquired Complete Soul Edge in Weapon Master
Became Lv 40 "Gold Mercenary" in Weapon Master
Defeated 50 Female Characters
Used Guard Impact against a Guard Break move
Five Successful Throw Escapes
Obtained New Costume in Weapon Master Shop
Twenty Perfect Victories
Ten Ring Out Victories
Standard Time Attack Cleared
Defeated 50 Male Characters
Team Battle Cleared
Fought 10 Times in Online Mode
Won 5 Times in Online Mode
First Victory in Online Mode
Successful Guard Break
Became Lv 6 "Platinum Neophyte" in Weapon Master
Purchased New Weapon in Weapon Master Shop
Three Successful Soul Charge Hits
First Trial Point Cleared in Weapon Master
Guard Impact Triple Success
Victorious over Inferno in Arcade
Ten Successful Counter Hits