This shouldn´t be too hard until the last days. All of the annoying disciplines like the Vault or Judo can be easily compensated. Whatever you do , just make sure you dont quit out off the Olympic mode.
ANd another thing: Make sure you´re able to get 17,9+ scores on parralel bars, it helps a lot in case the AI comes up with some magical jump in the Long Jump.( What helped me most was : when you need to direct the circles onto the hands, instead of going left and right i pressed up on both off the Sticks and adjusted very slowly and this gave me loads of stabilty. This way i was able to get mostly "Good" on them and getting excellent or perfect on the trigger taps , should prove to be more than enough for 17,9+ scores.
Doing every challenge and not even gold medalling a lot i still managed to get my stats maxed out and i could attack the last day:
Whatever you do, make sure you spread your weakest events apart , as you slow-mo will recharge if you dont use it for an event. In my case i did it this way and it seems fairly logical to do :
100m : used my slow-mo for great start then use bits of it , if your button-mashing or stick-waggling skills have left you like they left me after 4 hours of non-stop grind.
then onto the easiest event :
25m Quickfire: just make sure you get at least excellent on breathing, which shouldn´t be too hard, and it makes this event a breeze.
This allows your slow-mo to load up and you will only need a little bit for the next event:
Just make sure you get a good start and give it your all. Shouldn´t be too hard,
then getting onto the final straight:
If your struggling with this one, make sure you practice it extensively before you try this achievement. It can be done without , but its so much easier with it. 17,9+ score are needed( look at my guide above)
Now if your lucky like me , you have won your 4 events by now ( I had a tie for 1st in the Parallel Bars(17,9 score)) and you can lay back.
Otherwise, you should have a full Slow-mo bar to work with .
Sprint up to the 3 markers that are close to the end of the run-up and start your slow-mo. make your guy get close to full speed but especially to have excellent if not perfect jump and very near to 45% angle. If you fail , you should still have enough slow-mol for the 2 other tries. Rinse and repeat.
Dont rush it, even if you mess up one try, stay calm , get the slow-mo right and just jump.
After you completed the day , just before the fireworks ceremony, the achievement pops.
Congratulations to you ! :)