You can get three achievements in the village near the start of the game. For Juggler, head down the ladder below the room where you get the health/magic upgrades, then to the left (you can destroy the left-hand wall). Talk to the NPC here to initiate the flask juggling game. If you jump up and hit the flasks while up in the air, you stand a better chance of hitting the higher-point targets at the top and upper-sides of the screen. Either this is very easy, or I got very lucky, because I got the required 150 points on my very first attempt at this. The flashing red flasks shatter and can hit multiple targets, so prioritize those when you see them.
In the interest of creating as much of a one-stop-shop as possible, I've included 22 of the miscellaneous achievements in Shovel Knight in the video below. I wanted to include Knuckle Down as well, but the stage for that was already complete in my game and I haven't played back through again to unlock it. You can see Juggler at the
01:02 mark.