There is no guide for this game yet. But apparently it is EASY POINTS! 

 

Tip by BILLY BADBONES on character upgrades :

Having played the game once on the easiest of the difficulty's I decided it would not be needed to upgrade any of the characters and just play the game using either Jonny's flame or The Things Slam attack. On the later levels you can upgrade one character fully, but instead of proceeding with the game, as soon as the achievement pops exit right away to dashboard and simply replay the last level until you get to the upgrade selection again.

 

Because you didn't save the game your credits will still be there and you can go ahead and upgrade the next character.

 

You can do this on any difficulty, and its worth a whopping 320 G's 

 

Mr. Fantastic - 80 points

Upgrade all of Mr. Fantastic's Powers

 

Invisible Woman - 80 points

Upgrade all of the Invisible Woman's Powers

 

Human Torch - 80 points

Upgrade all of the Human Torch's Powers

 

Thing - 80 points

Upgrade all of The Thing's Powers

 

Hero - 120 points

Complete the game in normal difficulty mode.

 

Superhero - 160 points

Complete the game in Fantastic mode.

 

Doomed - 30 points

Defeat Dr. Doom

 

Skrull's Demise - 20 points

Defeat Super Skrull

 

Elemental Master - 20 points

Defeat Terrax

 

Skrull Slayer - 20 points

Complete Skrull Lair Level

 

Cold War Relic - 20 points

Complete Red Ghost Level

 

Wedding Crasher - 20 points

Complete New York Level

 

Rock Crusher - 20 points

Complete Terrax Level

 

Arctic Explorer - 20 points

Complete Military Base Level

 

Shanghai Success - 30 points

Complete Shanghai Level

 

Treasure Hunter - 80 points

Successfully unlocked all content in game.

 

Fantastic Four - 60 points

Find all of the silver four symbols.

 

Doom Tracker - 40 points

Find all of Doom’s Spy bots in the game.

 

Assist - 20 points

Successfully execute a 2-player fusion attack.