Defeat the Barbarian boss,then later,when you are stronger,go back and beat him repeatedly.It shouldn't take much,then collect 100 to 135 gold every time you kill him.Oh,and you get to make out with the princess as many times as you want
This achievement can only be done if either you play multiplayer online or have two controllers and it's one of the most confusing achievements in the game. Kill all the mobs with an alt account or get someone online to do it for you. Don't touch a mob until you get the achievement on your main account.
This achievement is one of the hardest, just keep looking to the right as far as you can and practice, your reactions will get better. Jump over logs, use the shadows to depict where the doorways are exactly, don't let the cat eat you.