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