Badlands Challenges:

Fast Mover 7- A Hulk Race in the Badlands. Collect all the markers in order as
quickly as possible. Again, jumping and wall-running are the best ways to move
fast. Keep your eyes open as you go for blue balls and red balls. Go, Hulk, Go!
:)

Hulk Smash Badlands!- Like Hulk Smash City, only in the Badlands. Same tips
apply here- go after vehicles, lampposts, and trees and totally destroy
everything you hit. Try to stay in the town area, it offers the most targets.
Oil pumps and rock pillars are available outside the town. You can not destroy
cows no matter what you do, so don't waste time on them. Have fun!

Puny Humans!- Like Soldier Seeker, only you must stay within the area marked by
flares while swatting soldiers. If you leave the area, the challenge ends.
Again, it only takes one hit to kill a soldier, so you should clean up here
easily. The best way to dodge missiles and stay within the flares is by jumping
up and down (coming down with a Ground Smash or Air Stomp move will decimate
your foes).

Gamma Golf- Urban Golf in the Badlands. Hit the ball to the flag with your club
in as few swings as possible. Try to keep it under par. :)

Blonsky Don't Surf- Shield Grinding in the Badlands. Collect as many blue balls
as you can within the time limit. Surf's Up, Dude!

Hulk Soccer- Try to smack the ball into the tunnel as many times as you can
before time runs out. Beware the Combat Warden Hulkbuster who acts as goalie-
he will try to block your shots and whenever you kill him, another is quick to
appear. More balls will appear as you knock the ball into the tunnel too (you
are not allowed to carry a ball into the tunnel unfortunately). Good luck.

Desert Dogfight- Destroy as many Comanches and Falcons as you can within the
time limit. Air Combos, Missile Catching, and Cyclone Skyjack help you once
again. The area is more open here, so you have more room to maneuver and dodge
missiles. Good luck and have fun.

Long Bomb- Destroy Comanches with Missile Catch and Missile Punchback moves
while staying inside the ring of flares. The more you destroy in the time
limit, the better your score. Master your Missile Return moves to win this one.

Unfriendly Fire- The hardest destroy-stuff challenge. You need to take out as
many soldiers as you can within the time limit using the soldiers' own
missiles. Dodge the explosion as quickly as you can and try to set things up so
other soldiers are caught in the blast. Good luck with this one, I have yet to
complete it myself. 

Wide Right- You must use the Punt Kick combo to knock a car through some
goalposts, staying behind a line of flares. Make as many goals as you can
within the time limit. The more you make, the better your score. Master the
Punt Kick before trying this challenge.

Gamma Field Goal- Like Wide Right, only now the goalposts are moving. Again,
master your Punt Kicks and your timing if you want to succeed.

I have not gotten gold on all challenges. I understand there's a person or two
on the GameFAQs message board who has. If my tips did not help you, seek these
people out. They might. Note- there is no reward for completing challenges
other than smash points and fun. So enjoy.