Iron Man

Actually is very easy, just attack a helicopter until it get low on health then take a little distance then charge against it (pressing LB + A).

I found out its easier with a helicopter than a tank since you can calculate better the aiming. Tip: dont charge to close to the enemy, is easier if you take a little distance

To unlock this achievement you will need to use your ramming ability to destroy or kill an object. This can be done on any mission (other then the first one and the last one) and can be completed by destroying or killing a tank, turret, person, etc. It also does not make a difference which difficulty your on.

I highly recommend getting this achievement on your Easy play-through.

I had a very hard time doing this achievement. I tried searching on the forums and guides for help but no can do. Here is what I can offer you and how I did it:

There are several methods that people have talked about on how to get this achievement (none worked for me but maybe they will work for you? Maybe I am as stupid as I sound :) - ). Here goes nothing:

1. The most promising one is outlined at x360a.org: "Shoot any object until it get low in health. For this description we are using a tank. Now once the tank is really low in health fly parallel to the ground and go straight towards it. Make sure to press the A button once you get started on your flypath. If Iron Man leans his righta arm back then it is a ram. If he doesn't bring his arm back then keep doing it until you get the achievement." So basically just hit your thrusters while in flight and hit something you have already almost killed. Did not work for me at all... If it did for you great! It not move on...

2. I found this in some forum I can't find anymore... Damage something until it's almost dead, hover up until you get to the same level as it and then use your thrusters in flight. That did not work for me, for you? If not move on to my insane method...

3. If you like insanity you will like this method. This method is used when all hope is lost and you can take it any more... First select a level that is not timed and has a base (so don't pick missions 1, 6, 9, 10, or 13). Now you can pick either the fully loaded Mark II suit or pick the Extremis Suit. Now go to any base with a fare amount of objects inside of it, shoot all of them until they are low on health. Now switch your power systems to thrusters (press left of the d-pad). Now start the insanity. Just fly (with thrusters) at anything you see. I found it easier to be at ground level to hit everything. Toss in a few random A button pressing for fun. After a short time I hit a tank, boom, unlocked!

I am sorry that I could not do a better job in writing this! If you have any other tips or tricks on how to do this let me know!