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.
To get all hats
Pass the game
Kill 100 enemies with a bow
Blow up 100 enemies with dynamite
Break 100 bottles
Break 70 bottles
Get all perks
Kill 100 enemies with a gun
Complete 10 repetitive tasks
Kill 40 enemies with a gun
Earn $100
Kill 100 animals
Pass the third act
Kill 100 enemies with a revolver
Skip 40 dialogs
Blow up 40 enemies with dynamite
Kill 40 animals
Pass the second act
Kill 40 enemies with a bow
Break 30 bottles
Kill 15 enemies with a bow
Kill 10 enemies with a bow
Blow up 15 enemies with dynamite
Kill 15 enemies with a gun
Kill 100 enemies with a rifle
Kill 5 enemies with a gun
Earn $50
Pass the first act
Kill 40 enemies with a revolver
Kill 10 animals
Skip 15 dialogs
Kill 100 enemies with a knife
Kill 40 enemies with a rifle
Earn $30
Kill 15 enemies with a rifle
Kill 5 enemies with a rifle
Skip 5 dialogs
Blow up 5 enemies with dynamite
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
Earn $10
Break 10 bottles
Pass the tutorial