Here is the full list of all 12 Castlevania: Symphony of the Night achievements worth 200 gamerscore.
Finish the game, including the inverted castle, as Richter.
Explore 200.6% of the game.
Collect a bank of $100,000.
Unlock/Cast all eight of Alucard’s spells.
Collect all five familiars in the game.
Unlock the Inverted Castle.
Defeat 10 consecutive enemies using special weapons without getting hit.
Obtain the Bat, Wolf and Mist transformations.
Defeat Gaibon and Slogra.
Defeat Dracula in the Bloodlines stage without getting hit.
Defeat 10 consecutive enemies using only magic without getting hit.
Defeat 10 consecutive enemies using standard weapons without getting hit.