Here is the full list of all 19 Samsara achievements worth 1,000 gamerscore. It takes around 1-2 hours to unlock all of the achievements on Xbox One.
Walk through 15 in-level portals during one level
Get Zee stuck within a puzzle
Complete the whole game again in inversed mode
Complete a whole chapter with all levels inversed
Complete a level inversed
Complete the game in 3 hours
Complete Samsara
Complete Chapter 8
Complete Chapter 7
Killed both versions of Zee simultaneously during a level
Complete Chapter 6
Complete Chapter 5
Complete Chapter 4
Complete Chapter 3
Complete Chapter 2
Complete Chapter 1
Killed by Vines
Complete the prologue
Fall from a big height