Here is the full list of all 23 "ZAZEN", zen meditation game achievements worth 1,000 gamerscore.
Started zen meditation
Started copying sutra
Started chanting sutra
Cleared zen meditation for the first time
Reached level 3
Reached level 5
Reached level 10
Reached level 15
Reached level 20
Reached level 25
Reached level 30
Reached level 35
Reached level 40
Reached level 45
Reached level 50
Finished copying sutra
Finished chanting sutra
Cleared zen meditation without making any mistakes
Cleared zen meditation 5 times
Cleared zen meditation 10 times
Cleared zen meditation 50 times
Cleared zen meditation 100 times
Practiced meditation in all the scenes