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