Here is the full list of all 13 Freefall achievements.
Play for a total of 1 minute.
Play for a total of 2 minutes.
Play for a total of 5 minutes.
Play for a total of 15 minutes.
Play for a total of 30 minutes.
Play for a total of 1 hour.
Play for a total of 2 hours.
Play for a total of 12 hours.
Play for a total of 1 day.
Play for a total of 1 week.
Play for a total of 1 year.
Congratulations on not dying!
Play for a total of 6 hours.