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