Here is the full list of all 23 Gunpowder on The Teeth: Arcade achievements.
Complete mission in the Far East
Complete Boss in the Far East
Complete mission in Middle Asia
Complete Boss in Middle Asia
Complete mission in Europe
Complete Boss in Europe
Complete missions in Africa
Complete Boss in Africa
Complete missions in South America
Complete Boss in South America
Open all locations
Destroy 100 trucks from assault rifle
Jump on the head of 250 enemies
Destroy 500 radars
Destroy all cargo on the train
Open secret character
Not observance of Safety Precautions
Touching the rotor blade
Touching the rotor blade. Again!
Collect 10 coins
Survive after an apple
I'ts Me! Meat Boy!
Bubba, they ain't there!