For this you have to 3-star all 9 chapters of the Hype Tour story. The chapters & their 3-star requirements:
Real Lego Senna 100% Not Fake - complete in 1:35 or less
100% Proof That Lego Valley Exists - reach a speed of 233km/h (~145MPH)
Could a Fake Car Do This? - complete in 40 seconds or less
Mini Mega Awesome Skill Park - achieve a score of 80,000 points or more
Brickchester Smash - achieve 20 or more wreckage skills
Storm Surge - finish in 55 seconds or less
Flight of the Ferrari - achieve a jump of 276M or more
Sennasational Speed - achieve 13 or more awesome speed skills
The Awesome Tour - complete in 2:02 or less
Most likely won't give too much of a problem. Some chapter specific tips:
Mini Mega Awesome Skill Park - this one took me a few tries, but I found that mixing up e-drifts, wreckage and air skills worked well. I didn't do a single long combo streak, but I think on my 3-star run I did 2-3 separate streaks that ended up totalling over 110K.
Storm Surge - the game has a route that directs you down to the aqueduct before hitting the finish, I found it easier to go through the city & come down on the finish than to try and navigate teh aqueduct. Having said that, I *barely* (maybe by 0.2 seconds) got 3 stars on this one.
Sennasational Speed - do *not* use rewind, if you do it resets your speed skill counter, which means even if you rewind back to a point where you're going 300+km/h you'll still only get "Good Speed" on the next trigger of the skill. The key is to just get to know the route and let off on the gas on those turns & maintain most of your speed.
The Awesome Tour - kinda obvious, but the recommended route has you doing a full lap around the speed track before the finish. This is unnecessary and you can shave several seconds off by turning towards the finish early & going offroad just before going onto the speed track.