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In order to get the jigsaw achievement you must After beating the game, return to Banjo's house in Spiral Mountain and stand at the edge of the carpet. Press Y and look at the picture of Bottles. If done right the game will start. If nothing happens you're not in the right spot, so move and try again.

There are seven puzzles to complete for the achievement. The puzzles will always break apart in the same pattern so if you are having trouble, try to do the same thing over and over until you get fast enough.