Here is the full list of all 12 JoJo's Bizarre Adventure HD achievements worth 400 gamerscore.
Complete Story Mode or Challenge Mode for any character on any difficulty without using continues.
Win a fight with 22 different characters.
Activate a Blazing Fists match.
Counter a time-freeze.
K.O. N'Dool via Perfect in bonus stage.
Down an opponent with a Super Combo.
Down an opponent without using a Super Combo or Tandem Attack.
Down an opponent while they are Stand Crashed.
Down an opponent while in child form.
Raise Mahrahia's magnetic power to maximum level.
Win one Ranked Match over Xbox LIVE.
Upload replay data.