Here is the full list of all 17 Shark Simulator achievements.
Use 20 health kits
Kill 10 000 civilians
Kill 500 cops
Reach 5 stars 10 times
Blow up 250 police cars
Kill 2000 people with the Machine Gun
Kill 2000 people with the Grenade Launcher
Kill 500 people with the Big Sword
Kill 250 people with the Flail
Kill 500 people with the Machine Gun in slow motion
Reach a skyscraper rooftop with the Harpoon
Kill 500 people using the Jet Pack and the Grenade Launcher
Parachute 20 times
Bite 1000 people
Bite 1000 cars
Stay 1 hour in slow motion with the Time Machine
Kill every civilian on the map without dying