Accomplish the indicated achievement to get the corresponding number of 
Gamerscore points:

  Betrayal (25 points): Defeat the traitor in the abandoned mineshaft. 
  Bizzare (25 points): Defeat Tokimune's bodyguards at Kyoto Palace. 
  Close (75 points): Defeat the Queen of Ice at the Ice Palace. 
  Conclusion (25 points): Defeat Ouka at London Castle. 
  Deep in the Ruins (25 points): Defeat Fire Golem in the sealed off area. 
  Defender (25 points): Defeat Poseidon at Entei's Temple. 
  Deja Vu (25 points): Defeat the Sphinx at the white flower field. 
  Destiny (25 points): Defeat Ouka in the abandoned mineshaft. 
  Fanaticism (75 points): Defeat Professor Kou at the magic research facility. 
  First Meeting (25 points): Fight with Yuuki in a gambling match. 
  Gaudian (25 points): Defeat Odin in the Sage's Tower. 
  Grand Finale (150 points): Unlock the Happy ending. 
  Immobile (75 points): Defeat Saisho at the Temple of Trials. 
  Mysterious Enemy (25 points): Defeat Minotaurus in the abandoned mineshaft. 
  Ocean (25 points): Defeat Aquagel at the wharf. 
  Purgatory (75 points): Defeat Entei at Entei's Temple. 
  Raid (25 points): Defeat Oboro at Iwato village. 
  Reform (25 points): Defeat Sayaka at Iwato village. 
  Rescue (25 points): Defeat Oboro at the Ninja mansion. 
  Resolve (25 points): Defeat Touya at the Ice Palace. 
  Riddle (25 points): Defeat the mysterious man in the Graveyard Town. 
  Running Wild (75 points): Defeat the Queen of Ice in the sealed off area. 
  Sea of Trees (25 points): Defeat Amazonia in the underground military path. 
  Subordinates of Ice (25 points): Defeat Siren in the Sage's Tower. 
  Tragedy (25 points): Defeat Cerberus at the magic research facility.