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
Victorious over Inferno in Arcade
Successful Guard Break
Ten Victories in Extra Survival Death Match
Acquired Soul Calibur in Weapon Master
Acquired Complete Soul Edge in Weapon Master
Defeated 50 Female Characters
Five Successful Throw Escapes
Became Lv 40 "Gold Mercenary" in Weapon Master
Defeated 50 Male Characters
Twenty Perfect Victories
Ten Ring Out Victories
Purchased New Weapon in Weapon Master Shop
Obtained New Costume in Weapon Master Shop
Became Lv 6 "Platinum Neophyte" in Weapon Master
Team Battle Cleared
Guard Impact Triple Success
Ten Successful Counter Hits
First Trial Point Cleared in Weapon Master
Unlock All the Achievements
Unlock All Characters
Victorious in Sudden Death
Standard Time Attack Cleared
Used Guard Impact against a Guard Break move
Ten Thousand Hits
Became Lv 72 "Iron Edgemaster" in Weapon Master
Obtained All Weapons in Weapon Master
First Victory in Online Mode
Won 5 Times in Online Mode
Fought 10 Times in Online Mode