This is achievement is really hard most of it is luck and the other half memory. you will need 4-5 booster's a lap to beat the 1:15 mark. Now go to arcade and set your car to sport as light will not be able to do the race, now start the race and go round it a couple times if you need to learn the track. Now all you have to do is use your boost at these parts in the race:
boost number 1
near the starting line there is a downwird slope with 3 crates try and collect two and you should be able to use it there.
boost number 2
after following the track you will see a loop the loop use it on the loop to gain extra speed.
boost number 3
after the loop and down the hill if you turn sharply use your boost and gain extra speed on the run.
boost nuber 4
when you are climbing the glass ramp if used the boost wil get you up with no effort.
boost number 5
after you get to the ice patch boost to make a speedy landing.
the last jump in the level is a small ramp that will take you to the table with candles on it.
now of course you have to train with the boost timing to get it right, i spent ages trying it but finally got the achievment.