Here is the full list of all 12 Half-Minute Hero: Super Mega Neo Climax achievements worth 200 gamerscore.
Cleared Hero 30.
Cleared "Cursed Hero" without defeating Sasha.
Offered a total of 3000G to the Goddess in a quest in single player mode.
Prayed to the Goddess for the first time in single player mode.
Became 30 times the True Hero in multiplayer mode.
Cleared Hero 300 in Hard Mode.
Allied with all available NPCs.
Cleared Hero 300.
Cleared Hero 3.
Got all available equipment in single player mode.
Reached every ending in Hero 30.
Received every title.