From the product page there are 50 places to practice meditation in.
To unlock a new place to meditate in, you must complete the previous one. Completion consists of meditating for at least 2/3 of the session time. You will note a spot on the bar that shows where this point is. If you move the bar will stop moving until the reminder to stop doing what you did wrong passes. You can do this quite a bit and still complete a level.
Here's a list of levels and the time you meditate (work in progress as we think on it):
Autumn leaves - 3 min
Sound of water - 3 min
Water surface - 3 min
Rocks - 5 min
Garden - 5 min
Zashiki - 5 min
Bamboo - 5 min
Hill - 5 min
On the bridge - 5 min
Wall - 5 min
Waterfront - 10 min
A view from a hill - 10 min
Cliff - 10 min
Floating island - 10 mins
Under autumn leaves - 10 mins
Path - 10 mins
Garden - 10 mins
Turret - 15 mins
Discipline - 15 mins
Gate - 15 mins
Corridor - 15 mins
Bamboo forest - 15 mins
On the boat - 15 mins
A gate of zen - 15 mins
A square - 20 mins
Forest path - 20 mins
Autumn leaves and water - 20 mins
A gate of self - 20 mins
Ripple - 20 mins
Poppy - 20 mins
Under the bridge - 20 mins
Red poppies - 30 mins
A cluster of poppies - 30 mins
Slope - 30 mins
Looking up - 30 mins
Big cliff - 30 mins
Looking down a waterfall - 30 mins
On the bridge - 30 mins
On the top of the East mountain - 45 mins
On the top of the West mountain - 45 mins
Temple - 45 mins
Path - 45 mins
Castle tower - 45 mins
Breeze on the hill - 45 mins
Rock face - 45 mins
Gardian dog - 60 mins
Cloud sea - 60 mins
Sunset - 60 mins
Waterfall - 60 mins
Ski - 60 mins
They noted that in order to clear the meditation on the longer ones, you will need to fill up the bar almost all the way, not just 2/3.
If you have issues with tracking, you can go to the options and turn sensitivity to Low or Lowest. I didn't have an issue so Normal was fine.