I included a 3 stars walkthrough for every time trial, pick whichever levels you want to reach a rating of 75:
ArlandAtrium OneAtrium TwoBurfieldChaseConvoy OneConvoy TwoCranes OneCranes TwoEdgeFactoryFlightHeatNew EdenOfficePlayground OnePlayground TwoPlayground ThreeShard OneShard TwoStormdrains OneStormdrains TwoStormdrains ThreeDLC Levels (thx ovendonkey !)ActinoActino RiseChromaFlowKineticRazzmatazzReflexSynesthesiaVelocity