Full list of all 30 SoulCalibur II HD Online achievements worth 400 gamerscore. It takes around 10-12 hours to unlock all of the achievements on Xbox 360.
Three Successful Soul Charge Hits
Successful Guard Break
Fought 10 Times in Online Mode
Won 5 Times in Online Mode
First Victory in Online Mode
Victorious over Inferno in Arcade
Used Guard Impact against a Guard Break move
Acquired Complete Soul Edge in Weapon Master
Twenty Perfect Victories
Five Successful Throw Escapes
Obtained New Costume in Weapon Master Shop
Defeated 50 Male Characters
Ten Ring Out Victories
Guard Impact Triple Success
Became Lv 6 "Platinum Neophyte" in Weapon Master
Purchased New Weapon in Weapon Master Shop
Ten Successful Counter Hits
First Trial Point Cleared in Weapon Master
Unlock All the Achievements
Unlock All Characters
Ten Victories in Extra Survival Death Match
Victorious in Sudden Death
Standard Time Attack Cleared
Team Battle Cleared
Ten Thousand Hits
Acquired Soul Calibur in Weapon Master
Became Lv 40 "Gold Mercenary" in Weapon Master
Became Lv 72 "Iron Edgemaster" in Weapon Master
Obtained All Weapons in Weapon Master
Defeated 50 Female Characters