Start Game to get the "Dokkaebi" Achievement

Click on "English" then on "Play" and click on "1"

Complete Level 1 to get the "Hentai" Achievement

Go back to "Play" and click on "3"

Complete Level 3 to get the "Tyan" Achievement

Go back to "Play" and click on "5"

Complete Level 5 to get the "Chicken" Achievement

Go back to "Play" and click on "20"

Complete Level 20 to get the "Tyan" Achievement

Enjoy your new 100%