Lab Technician Achievement
Play and complete a game session of Game Lab in the Multiplayer Public playlist.
The Game Lab is designed to let you create customized games with special rules. You can also join custom games other people have created. The achievement requires you play a complete session from start to finish in a public game, so setting up a private game with friends does not qualify.
To access the Game Lab, choose Multiplayer from the main menu, then use the to select Game Lab in the middle of the screen and press . From the Game Lab menu, choose the default option on the left by pressing and then again to search for a public game.