Here's how you can efficiently play Sonic Colors: Ultimate to obtain the following achievements related to Red Star Rings:
✪ "The Complete Set" - Obtained by collecting all 5 Red Star Rings in any level
✪ "No Ring Left Behind" - Obtained by collecting all 30 Red Star Rings from any area
✪ "Reach for the Stars" - Obtained by grabbing all 5 Red Star Rings in One Run on Any Act
✪ "Superstar" - Obtained by collecting all 180 Red Star Rings
+ Many many more!