Here is the full list of all 22 CropDuster Supreme achievements.
Complete the 'Shart' Difficulty
Gas 5000 civilians
Complete the 'Fart' Difficulty
Munch 100 burritos
Collect 100 Clocks
Clear the Wedding
Complete the 'Toot' Difficulty
Clear the Gym
Munch 25 burritos
Collect 25 Clocks
Gas 1000 civilians
Clear the Elevator
Clear the Hotel
Clear the Airplane
Gas 500 civilians
Clear the Airport
Clear the Gas Station
Munch 5 burritos
Collect 5 Clocks
Clear the Parking Lot
Gas 100 civilians
Clear Burrito Hut