From FTL Wiki
While using the Federation Cruiser, use your crew in 4 special blue event choices by sector 5.
- You will find most of the crew-related blue events in their respective sectors, especially homeworlds. Therefore, it is best to head for, assuming you are using the Osprey (which has the most types of crew of the 3 layouts), the Mantis, Rock and Engi controlled sectors and homeworlds.
- If you find one early, a slug can be very useful. Humans have no blue events so are useless in this achievement.