Aliens...
	Arena Challenges...
	Various Achievements...

Perform the following to unlock the aliens.

Alien	How to unlock
Aerodactyle	Complete Level 2: Mess Hall Mashup.
Big Chill	Complete Level 3: Welcome to Erf.
Bullfrag	Complete Level 2: Mess Hall Mashup.
Cannonbolt	Complete Level 5: Core of the Problem.
Gravattack	Complete Level 4: Underground and Beyond.
Swampfire	Complete Level 1: Stow Away.
XLR8	Complete Level 4: Underground and Beyond.

Perform the following to unlock the challenges.

Challenge	How to unlock
Attrition	Obtain Arena Token in Level 2: Mess Hall Mashup.
Big Hits	Obtain Arena Token in Level 4: Undertown and Beyond.
Magnet	Obtain Arena Token in Level 1: Stow Away.
Malfunction	Obtain Arena Token in Level 5: Core of the Problem.
No Time for Heath	Obtain Arena Token in Level 3: Welcome to Erf.
Sale on Turrets	Obtain Arena Token in Level 6: No Time for Sightseeing.

Complete the following achievements to unlock Microsoft Gamerscore points.

Achievement	How to unlock	Points
All In a Day's Work	Complete the game.	50
Bad Case of Gas	Defeat 25 Gas Infantry.	15
Block Party	Collect both of Bloxx's Upgrade Tokens in Single Player.	25
Breakout	Smash 25 Breakable Walls.	10
Bullseye!	Detonate 150 Explosive Walls with a projectile.	30
Can't We All Just Get Along?	Defeat all Arena Challenges.	30
Challenge Accepted	Collect all the Arena Challenge Tokens.	20
Check Out These Pythons	Collect both of Four Arm's Upgrade Tokens in Single Player.	25
Do You Even Lift?	Defeat 25 Powerlifters.	15
Fastball Special	Detonate 25 Explosive Walls with a projectile.	10
Flame Retardant	Defeat 25 Fire Infantry.	15
Frozen Assets	Defeat 25 Ice Infantry.	15
Hero	Complete the game on Hero Difficulty.	20
How I Roll	Collect both of Cannonbolt's Upgrade Tokens in Single Player.	25
I'm Cool Like That	Collect both of Big Chill's Upgrade Tokens in Single Player.	25
I'm Not Dead Yet!	Change from Ben back into an Alien Form without dying.	15
Incursean Incursion	Complete Level 2.	30
Infiltrate Exterminate	Complete Level 5.	30
Jump, Jump	Leap over 75 Jumpable Walls.	20
Kill You Last	Defeat 25 Commandos.	15
Lack of Communication	Complete Level 1.	30
Leapfrog	Leap over 25 Jumpable Walls.	10
Learned Scholar	Complete the Tutorial Level.	10
Lillypad Shootout	Defeat 25 Toad Assault Mercs.	15
Long Jump	Jump over 20 pits.	10
Marathon Man	Run 42,195 meters.	50
More Power!	Collect 1,000 Omnitrix Energy Orbs.	30
New Kid on the Block	Complete Level 3.	30
Newtonian Alien	Collect both of Gravattack's Upgrade Tokens in Single Player.	25
Not Just Another Toadie	Defeat 25 Toad Battlers.	15
Outta There!	Complete Level 6.	30
Return To Sender	Use the "Return to Azmuth" option in the Pause Menu.	5
Sharpshooter	Detonate 75 Explosive Walls with a projectile.	20
Smash and Grab	Smash 150 Breakable Walls.	30
Speedy Recovery	Collect both of XLR8's Upgrade Tokens in Single Player.	25
Spring Shoes	Leap over 150 Jumpable Walls.	30
Super-Chirp	Collect both of Crashhopper's Upgrade Tokens in Single Player.	25
Tank Spanker	Defeat 25 Toad Tank Mechs.	15
Tastes Like Chicken	Collect both of Bullfrag's Upgrade Tokens in Single Player.	25
Underground Scene	Complete Level 4.	30
Wing and a Prayer	Collect both of Astrodactyl's Upgrade Tokens in Single Player.	25
Wrecking Crew	Smash 75 Breakable Walls.	20
You Break it, You Bought it!	Break 100 Omnitrix Energy containers.	30
You're On Fire!	Collect both of Swampfire's Upgrade Tokens in Single Player.	25