Voice Studio is a free app available in the social section on the the dashboard. (Video Kinect may need to be installed for it to show up)
For this achievement you need to complete all 8 tracks in the game you must say something for each phrase for the app to recognise it. Save and upload the tracks for the achievement.
Track 1 has 30 phrases, Track 2 has 40 phrases, Track 3 has 50 phrases, Track 4 has 60 phrases, Track 5 has 70 phrases, Track 6 has 80 phrases, Track 7 has 90 phrases and Track 8 has a whopping 100 phrases.
Note each track is unlocked by completing the previous one.