Full list of all 12 Mega Man 9 achievements worth 200 gamerscore. It takes around 15-20 hours to unlock all of the achievements on Xbox 360.
Clear the game by using the least amount of Weapon Energy possible.
Clear the game by defeating the fewest number of enemies possible.
Clear the game without using any Energy or Mystery Tanks.
Clear the game without dying.
Clear the game in 60 minutes or less.
Clear the game 5 times in 1 day.
Clear the game without continuing.
Defeat the 8 Bosses with the Mega Buster.
Defeat a Boss without getting damaged.
Defeat every type of enemy.
Clear the game once.
Defeat your 1000th enemy.