Marvel Super Hero Squad: The Infinity Gauntlet

Iron Man has 2 (technically 3) heroic feats to complete to get this achievement.

1) Collect 100 Power Stone Fragments. Play through the 1st level and collect all the stones you can. Then play through the Asteroid Field level and do the same. It's going to take a couple of redos on the Asteroid Level to collect all the stones. Finally, after beating Gamesmaster's level and unlocking Wolverine, free play level 1 again and when you see the electric looking cage in the background (it's one of the first rooms), use Wolverine's claws to tear it open. I collected 103 stones between Level 1 and the Asteroid Field.

2) Collect 3 Stark Packages.

The first one is on the Helicarrier. I make a habit of walking the entire thing after every level, because there's always a new collectable as players are being introduced.

The second one is the free play on level 4. Where Invisible Woman and Nova repaired the first pipe, there is a console that a "Tech" hero has to open; inside are stone fragments and a Stark package.

Finally, in Level 5. In the first maze in the upper left hand corner.

Kind of like the Platinum Trophies on PS3, once you defeat the two, you automatically get the 3rd, and unlock this achievement!