While some assumed that achievements would be unique to the XBLA version of this game, they are, in fact, available in all versions as "challenge". Here is a list of challenges that are included as achievements on the XBox 360:
Jitterbug - Clear the game in 60 minutes or less.
Invincible - Clear the game without dying.
Almost Invincible - Clear the game without continuing.
No Coffee Break - Clear the game without using any Energy or Mystery Tanks.
Peacekeeper - Clear the game by defeating the fewest number of enemies possible.
Conservationist - Clear the game by using the least amount of Weapon Energy possible.
Gamer's Day - Clear the game 5 times in 1 day.
Whomp Wily! - Clear the game once.
Destroyer - Defeat your 1000th enemy.
World Warrior - Defeat every type of enemy.
Trusty Sidearm - Defeat the 8 Robot Masters with the Mega Buster.
Blue Bomber - Defeat a Boss without getting damaged.
Here is the full list of available challenges:
- WALTZ - Clear the game in 120 minutes or less
- TANGO - Clear the game in 90 minutes or less
- JITTERBUG - Clear the game in 60 minutes or less
- BUSTAMOVE - Don't miss with the Mega Buster and clear the game
- HEADBANGING - Defeat 8 bosses without your helmet
- BUNNY HOP - Clear any stage jumping 50 times or less
- MR. TRIGGER HAPPY - Clear the game with more than 500 Mega Buster shots
- DOUBLE TROUBLE - Visit all stages twice and clear the game
- MR. PERFECT - Clear the game without getting damaged
- INVINCIBLE - Clear the game without dying
- ALMOST INVINCIBLE - Clear the game without continuing
- NO COFFEE BREAK - Clear the game without using any energy or mystery tanks
- AIR SHOES - Clear the game without falling into any holes
- MEGA DIET - Clear the game without picking up more than 8 energy pellets
- ENCORE - Clear 4 stages using the same special weapon
- PEACEKEEPER - Clear the game by defeating the fewest number of enemies possible
- CONSERVATIONIST - Clear the game by using the least amount of weapon energy possible
- FAREWELL TO ARMS - Clear 4 stages without using a special weapon
- GAMER'S DAY - Clear the game 5 times in one day
- DAILY DOSE - Clear the game once a day for 3 days
- WHOMP WILY! - Clear the game once
- TRULY ADDICTED! - Clear the game for the 10th time
- TRULY HARDCORE! - Clear the game for the 30th time
- CONQUEROR - Defeat your 100th enemy
- VANQUISHED - Defeat your 500th enemy
- DESTROYER - Defeat your 1000th enemy
- WORLD WARRIOR - Defeat every type of enemy
- TRUSTY SIDEARM - Defeat the 8 bosses with the Mega Buster
- PACK RAT - Collect 999 screws
- VALUED CUSTOMER - Purchase all items
- SHOP A HOLIC - Purchase 30 items or more
- LAST MAN STANDING - Defeat all bosses with only one pixel of energy left
- SURVIVOR - Defeat one boss with only one pixel of energy left
- HARD ROCK - Reach a boss' room without getting damaged
- HEAVY METAL - Reach a boss' room without shooting
- SPEED METAL - Reach a boss' room without stopping once
- FANTASTIC 9 - Accumulate 9 lives
- FULLY UNLOADED - Hit a boss with all special weapons before defeating it
- BLUE BOMBER - Defeat a boss without getting damaged
- ECO FIGHTER - Defeat a boss with only the Mega Buster
- MARATHON FIGHT - Fight a boss for 10 minutes
- QUICK DRAW G - Defeat Galaxy Man in 10 seconds or less
- QUICK DRAW C - Defeat Concrete Man in 10 seconds or less
- QUICK DRAW S - Defeat Splash Woman in 10 seconds or less
- QUICK DRAW H - Defeat Hornet Man in 10 seconds or less
- QUICK DRAW J - Defeat Jewel Man in 10 seconds or less
- QUICK DRAW P - Defeat Plug Man in 10 seconds or less
- QUICK DRAW T - Defeat Tornado Man in 10 seconds or less
- QUICK DRAW M - Defeat Magma Man in 10 seconds or less
- QUICK DRAW X - Defeat the final boss in 180 seconds or less
One does have to wonder how the order of the Quick Draw challenges were arrived at. Since the order does not match the Boss Order, is the Quick Draw list intended to be a decoy to confuse gamers?

A list of Challenges from the Wii version. Challenges earned have a crown next to the name.
Downloadable content is one of the hottest topics of Mega Man 9 discussion at the moment. We've got the scoop on what DLC is coming, how much it will cost, and what you will be able to buy for your money.
Another interesting feature of Mega Man 9 is the addition of an item shop. Because this is a difficult game, you are offered the opportunity to purchase items rather than finding them scattered across the levels.
Items in the shop are purchased using Bolts found strewn through the various levels.
(Pro tip: Use the Hornet Chaser to grab bolts stuck in tight crevasses!)
1 UP
20 Bolts
Gives Mega Man an extra life
Energy Tank
30 Bolts
Refills health meter to max
Mystery Tank
50 Bolts
Refills health meter and all secondary weapons
Call Eddie
50 Bolts
Eddie shows up to give you a random item
Call Beat
50 Bolts
Saves Mega Man from falling down a pit
Energy Balancer
100 Bolts
Automatically distributes power-ups to the weapon most in need
Guard Up
100 Bolts
Halves the damage done by enemies
Shock Guard
50 Bolts
One-time invulnerability to spikes
Costume
200 Bolts
Young Roll joins the fight with a new look!
Hairstyle Book
20 Bolts
Gives Mega Man hair instead of a helmet