Requires you to activate all 7 probes (one on each planet) using a probe scanner, and at the final probe when *spoilers* a rift opens up and you see the wanderer approach the probe and a prompt should pop up saying to take a picture, activate the prompt and you should get the achievement. Remember this can only be done on the final probe and he only stays 30 seconds after activating, but if you miss him upon re activating the final probe he will reappear.