Here is the full list of all 46 12 is Better Than 6 achievements. It takes around 4-5 hours to unlock all of the achievements on Windows.
Kill 100 enemies with a gun
Earn $50
Kill 40 enemies with a gun
Blow up 40 enemies with dynamite
Earn $30
Pass the first act
Skip 15 dialogs
Kill 40 animals
Kill 15 enemies with a gun
Kill 5 enemies with a gun
Break 30 bottles
Kill 100 enemies with a rifle
Kill 40 enemies with a rifle
Earn $10
Skip 5 dialogs
Kill 15 enemies with a rifle
Kill 5 enemies with a rifle
Kill 10 animals
Kill 100 enemies with a revolver
Blow up 15 enemies with dynamite
Blow up 5 enemies with dynamite
Kill 100 enemies with a knife
Break 10 bottles
Kill 40 enemies with a revolver
Kill 40 enemies with a knife
Kill 15 enemies with a revolver
Kill 10 enemies with a revolver
Kill 15 enemies with a knife
Kill 10 enemies with a knife
Pass the tutorial
Pass the second act
Pass the third act
Pass the game
Earn $100
Get all perks
Blow up 100 enemies with dynamite
Complete 10 repetitive tasks
Kill 100 animals
Kill 10 enemies with a bow
Kill 15 enemies with a bow
Kill 40 enemies with a bow
Kill 100 enemies with a bow
Break 70 bottles
Break 100 bottles
Skip 40 dialogs
To get all hats