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