The Super Mission 1 is the Reef Shark's Super Mission. It requires 25,000 points to complete the mission and it will rewards you with 300 coins once you complete it. This is first super mission that has a cheap reward.
How to unlock and complete
To unlock it, you must complete the other 8 of the Reef Shark's missions. For completing it, go to Arctic Land, eat banks of creatures to get a high multiplier, and then eat some creatures to score points and undergo a gold rush. Repeat this until you complete the mission.