After spending a bit of time on this, and coming back multiple times to try and finish this game, it finally all came together. I recommend practicing the events separately, as you will eventually figure out ways that work for you. This is how I originally figured out the javelin, long jump, and knew I could get a good time in the running events. Some of my info I will be doubled from above, but here's what I did.
Run Point Total - 611(It was a dream run, first in every event)
Sprint - 7.10
I have my Kinect set at about knee level for this. When it shows the word set, get into a runner's stance, with one hand back and bend over. Once the text goes away, say "one Mississippi" and take off running. Keep your knees high, arms moving back and forth, and don't stop. Go as fast as you can, but try to keep a consistent form. Even if you think you are early, do not stop unless it says a false start. On my best runs, I had starts that seemed to come before the guy says go, but it registered as valid. Once you cross the last thin white line(last 10 meters) bend over and you'll boost over the line. Only move on if you have below a 7.65.
Javelin - 114.65
Again, I kept my Kinect at the knee level. For this, I could only get a good throw with my left hand. When running, focus on getting high knees but you do not have to run anywhere near as fast. For your arm, I kept it at a position slightly above what the Kinect would register as me trying to pause. Make sure you keep it away from your body and don't keep it close. Run, and at the green swing your arm through with a slight increase in angle, but do not bend your elbow. I was consistently getting above 110. Only move on if you get above 105, or place around 4 or better.
Long Jump - 13.22
This one has the potential to get back a bunch of points. The AI won't get above 13, and it isn't too hard to get a high 12, or even 14. Run as you do with the Sprint, high knees, arms back and forth, and as fast as you can with good form. Once you hit the green, jump up as high as you can and swing your arms or hands in circles. Swinging your hands works most of the time, but it is more consistent to swing your arms. You need to win this event, or at least be within a few points of the top place.
Discus - 86.21
Until my dream run, my best was 56. That 56 came in a tournament where I lost by 2 points, 590 vs 588. For this move your Kinect about to shoulder/chest level. Retune your Kinect by pressing Y so that it can see your arms fully. Select the discus with your right hand, and take a step forward with your left foot so that you are in a straight wide stance. Similar to Javelin, you want to keep your arm straight as much as you can, and away from your body. Begin by twisting to your right, and bring your right hand behind you. Bend your knees a bit, and your right hand should be a bit below the waist level. From here, swing through with your hips, and bring your arm slightly up in angle, unwinding your hips and straightening your stance. Halfway through, you will want to bring your back foot(right) forward and while swinging you should step forward. So you will end with a similar foot stance as you started, just opposite. Continue twisting your hips, turning, swinging your arm forwards, but once you are near the end of a full swing, you can bend your elbow. Your end stance will have you ending facing to the left. This reminds me of a golf swing. After doing really bad in the discus, this was what I tried during my winning run. Hit 84. 82, 86. You need to be in the top 3 to have a chance here.
Hundles - 15.03
Move the Kinect back to the sprint level and retune it. The same as sprinting, get into a runner's stance, wait for the word SET and say one Mississippi. This seemed to have a slightly longer wait, so you may want to say one Mississippi two. This could also be because I knew I was about to unlock the achievement and was slightly excited to get it. Nonetheless, I false started 2 times in a row and had to wait for the word Go. Again, run as fast as you can with good form, high knees, and when the hurdle turns green jump. Try and jump sort of like a gallop or how the game is doing it for the most optimal run. I wasn't able to do this so I ended up stopping and jumping with both foot and clumsily getting back up to speed. I also hit a hurdle here by jumping a bit too late, so I could have gotten a better time.
Hopefully, some of these tips help! Looking back, this is NOT as hard as it sounds, it just take s a bit of practice. 6 months before I got the achievement, I gave this achievement a few
tries with no luck. I got nowhere near and lost hope. The day before getting this achievement, I gave it a new try and got 5th, 4th, 2nd, 6th, 5th. I was incredibly sore the next day(the day of writing this) but wanted to give it a shot. On my second try, I completely dominated and won by 28. This achievement will take some practice, sweet, and time. You WILL be sore the days after doing is. But it is not as hard as the ratio makes it sound.
Any other information needed, feel free to message me.