From the Main Menu select Multiplayer, then choose Xbox LIVE. Select Play Cooperatively in Classic Mode, and then choose Start a New Match. From there, select Picture Puzzles and choose Amazing Stories - June 1940 or any puzzle you are familiar with.
Once you've decided your puzzle choose these settings:
Experience Level - Beginner
Number of Pieces - (lowest amount passed 300)
You need at least 3 players total in the session when completing the puzzle. You can find players to help you with this achievement in the Achievement Trading Thread located HERE.