The game and its achievements are very straight forward. You will unlock the majority of them with a boosting partner, but there are a couple that will require that you pull off certain things.
When playing the single-player, make sure to have your guard up almost at all times, and if you see that your opponent is approaching a punch, walk a little backwards to avoid being hit by him. Once your opponent is done handing out punches, or if they are out of power, then this is your time to strike. Start walking towards them, dealing out two or three punches, and then use your special power by holding in RB and using any of your A, B, X or Y buttons. Pressing the B or A button releases a heavier attack than the other buttons and will take more of your Power Charge away. After this, your robot will probably be exhausted, so immediately put your guard up (RT), and start walking backwards again. As you defeat your opponents, you will have to fight even stronger ones. If you know that you will have difficulties defeating them, just fight the ones you've already fought to earn some TBR (Total Battle Rating). You will see that your rating will go down after each fight. This is all natural because your robot is feeling weak and needs repairs. To repair your robot, go to the main menu and go to Assembly Mode. Click on your created robot and then Quick Repair. This will increase your robot's rating and you will be good to go.
If you're playing the Single-player and get knocked down and know that you won't make it up, simply hit start and restart the match. By doing this you won't have to spend credits to repair your robot, and you won't lose TBR.
By winning (and losing) fights you will earn credits. With these credits you can repair your robot, or buy your robot new parts like a new head that takes more punches or fists that deals more damage. You can also purchase a totally new robot! My advice is that you save your credits only for repairs and body parts as this is the only thing you really need for the full 200 G.
Source : http://www.trueachievements.com/real-steel-walkthrough.htm?page=2
