Full list of all 12 Phantasy Star II achievements worth 200 gamerscore. It takes around 25-30 hours to unlock all of the achievements on Xbox 360.
Finish the game by defeating Mother Brain.
Defeat Dark Force.
Advance one of your party to Level 30.
Watch the entire in-game credits roll.
Use a Hidapipe.
Use an Escapipe to escape a dungeon.
Advance one of your party to Level 20.
Open all four dams.
Acquire the Laser Cannon.
Advance one of your party to Level 10.
Reach the Tower of Nido.
Spend 1,200 Meseta on one item.