One More Quarter - Go into Help and Options and from there into Settings. Simply turn the Arcade Monitor on and start a game. The achievement will unlock immediately.
Bumbling Knight - Again really easy. Just start a game using Home game mode and press any direction when the game prompts you to use A to attack with your sword. Do this five times to use up your five lives and when you are returned to the game menu the achievement will unlock.
Thankfully there are no Kinect-only achievements...