Iron Man 2

This is a pretty self explanatory achievement.

Get 100 melee kills with either Iron Man or War Machine. It can be done on any level or against any enemy.

To melee, you hit X. You can chain together moves and combos, for a list, hit start and check melee moves.

There are a few good places for this.

Level 6 has tons of small one hit drones and an infinite spawn at the end. Also, level 4 using the same.method most use to farm weapon kills.

If you combine this with getting 50 melee kills whilst Invincible as Iron Man, that will gain you another achievement.

Hope this helps, any questions just ask.

A good area to grind kills for weapon achievements is Level 3 at the start. When going through the level down pass the lasers trigger them off to make some enemies spawm. Continue on and you will come to a door with 8 machine gun turrets shooting at you (Four on each side). Shoot the turrets andyou will get a checkpoint. Quit the level and load up again and repeat to get the achievements. If you quit before the checkpoint the kills won't count towards the achievement.