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Achievements
Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement - How to unlock
Ace Pilot ( 20 points )
Pull off some flawless flying.

Airdevil ( 10 points )
Improve your Air Boost.

Almost There ( 25 points )
Save the fifth continent.

Basher ( 10 points )
Get your Werehog level up.

BFFs ( 20 points )
Become better friends with Chip.

Blue Meteor ( 20 points )
Dash through the white walls at top speed.

Blue Streak ( 30 points )
Create an unbeatable Hedgehog.

Combo King ( 20 points )
Work on your combos.

Crasher ( 10 points )
Get your Werehog level up even higher.

Creature of the Night ( 15 points )
Get a high score with Sonic the Werehog.

Day Tripper ( 20 points )
Race through all stages.

Exotic Toppings ( 10 points )
Eat all the hot dogs in Mazuri.

First Time Customer ( 10 points )
Buy something from Wentos.

Fried Clam Roll ( 10 points )
Eat all the hot dogs in Adabat.

Full Moon ( 50 points )
Collect all of the Moon Medals.

Get on the Exorcise Bandwagon ( 20 points )
Drive dark spirits away.

Getting the Hang of Things ( 15 points )
Get a high score with Sonic the Hedgehog.

Gyro with Relish ( 10 points )
Eat all the hot dogs in Apotos.

Half Moon ( 30 points )
Collect Moon Medals.

Hard Boiled ( 10 points )
Eat all the hot dogs in Eggmanland.

Hard Day’s Night ( 20 points )
Blast through all stages.

Hedgehunk ( 5 points )
Talk with people in the pursuit of love.

Helping Hand ( 20 points )
Help someone in need.

Hungry Hungry Hedgehog ( 30 points )
Eat everything in the world.

Hyperdrive ( 10 points )
Improve your Lightspeed Dash.

I Ain't Afraid of No Ghost ( 5 points )
Someone is dealing with spectral troubles.

Iced Hotdog ( 10 points )
Eat all the hot dogs in Holoska.

Kebab on a Bun ( 10 points )
Eat all the hot dogs in Shamar.

Ketchup and Mustard ( 10 points )
Eat all the hot dogs in Empire City.

Knockout Brawler ( 20 points )
Smash, smash, and smash some more.

Lay the Smackdown ( 10 points )
Improve your Stomp.

Looking Better ( 25 points )
Save the second continent.

Oh, You Shouldn't Have! ( 10 points )
Give a souvenir to the Professor.

One More to Go ( 25 points )
Save the sixth continent.

Partly Cloudy ( 30 points )
Collect Sun Medals.

Picking Up the Pieces ( 25 points )
Save the fourth continent.

Pig in a Blanket ( 10 points )
Eat all the hot dogs in Spagonia.

Power Overwhelming ( 30 points )
Create an unbeatable Werehog.

Ring Leader ( 20 points )
Gather Rings from all over the world.

Sausage Fried Rice ( 10 points )
Eat all the hot dogs in Chun-nan.

Smasher ( 10 points )
Get your Werehog level up some more.

Social Butterfly ( 30 points )
Talk to people around the world.

Speeding Ticket ( 20 points )
Become the fastest thing alive.

Still a Jigsaw Puzzle ( 25 points )
Save the third continent.

Still Broken ( 25 points )
Save the first continent.

Sunny ( 50 points )
Collect all of the Sun Medals.

That's Enough, Seriously ( 20 points )
Give every souvenir to the Professor.

Thrasher ( 10 points )
Get your Werehog level way up there.

Wall Crawler ( 10 points )
Improve your Wall Jump.

World Savior ( 100 points )
Complete the game.

Defeating Dark Gaia
After the cinematics, you will play as the Gaia Colossus dashing through Dark Gaia with the correct button. Dodge or smash the rocks to reach Dark Gaia and get closer. He will shoot a laser after awhile. When he is about to shoot, guard and move to a side to dodge it. You will get hit at least two times. You will then go into a "quick thinking" phase were you have to press the correct buttons. If done correctly, Dark Gaia will get a hold of you and you will play as Sonic. As you go through the Colossus, you will have to press the correct buttons to hit Dark Gaia's big eyes. You will have to repeat this all two more times, then stage gets harder. After you are done, you will enter the Super Sonic stage, where you will start to fly towards Perfect Dark Gaia. When you get near the Force Shield, Chip will enter the shield in the Colossus. You will then have to hit the snakes outside of the shield as their heads leave it. As you hit the snakes, Dark Gaia will attack. Avoid the rocks and lasers he shoots. After you knock out all the snakes, the shield will drop. Then Dark Gaia will grab the Gaia Colossus. You will now have to press the correct buttons to save him using Super Sonic. After you free the Gaia Colossus, Dark Gaia will shoot a laser at it. You will have to press a particular button a certain number of times to block it. If done correctly, Super Sonic will fly towards Dark Gaia's middle eye. You can use [Boost] while flying there if desired. When it is over, your grade will be based on how fast you did it.

Eggmanland Hub World
In order to unlock the hub world for Eggmanland, you must defeat the final boss and beat the game.

Walk through walls
If you go up to pretty much any wall/door as a werehog, pressing X Y Y for the combo, followed by shielding, will let you pass through the wall.