| Achievement/Trophy | How To Unlock |
| EYES ON ME | Win a victory lap. |
| BABY THROTTLE | Win your first race. |
| ANCHORS AWEIGH | Win a Cup in easy mode. |
| A BABY’S DUTY | Win all Cups in easy mode. |
| GOING STRONG | Win a Cup in Normal mode. |
| BOUND FOR GLORY | Win all Cups in Normal mode. |
| A BABY’S GOTTA DO WHAT A BABY’S GOTTA DO | Use boost for the first time. |
| DASH AND DESTROY | Break 5 objects in a single race using boost. |
| JACK OF ALL TRADES | Play as each racer at least once. |
| ALL-STAR TEAM | Win with all racers. |
| I’M SO GOOD | Win at the last second in Grand Prix Mode. |
| SLIMED! | Activate the Slime valve for the first time. |
| SLIME-MANIA | Activate the Slime in all the locations. |
| SLIME ATTACK | Take down at least 3 opponents in a single race. |
| SLIME MY RIDE | Use a custom power up for the first time. |
| POWERFUL | Use custom power ups for all the racers. |
| STOOP KID | Beat your record for first time. |
| TURTLE BROTHERHOOD | Co-operative special attack for the first time. |
| MAKE PAPA STU PROUD | Modify your kart for the first time. |
| WARRIOR | Compete in the Arena for the first time. |
| HEAVYWEIGHT CHAMPION | Compete 10 times in each Arena mode. |
| DAS SUBWAY | Find a shortcut. |
| SLIME RIDER | Put in the miles on the jetski. |
| GETTING GOOD AT THIS | Win a Cup in Expert mode. |
| THE BEST AROUND | Win all Cups in Expert mode. |
| CHAMP | Win 9 victory laps. |
| MOGUL | Unlock every upgrade in the store. |
