Just the Two of Us Achievement in Halo Infinite
Access your Personal AI.
This can be done early in the tutorial when you interact with a panel to install your AI near the start.
At the main menu screen select the third option down for Academy and then the first option to start the tutorial.
After the cut-scene follow the waypoint to the panel and interact.
If you continue and finish the tutorial you will also unlock the achievement ”Doing Your Part. This should only take 5 – 10 minutes.