Here is the full list of all 7979 Viewpoints achievements. It takes around 2-3 hours to unlock all of the achievements on Windows.
Pass the level B
Pass the level A
Pass the level Z
Pass the level X
Pass the level Y
Pass the level W
Pass the level U
Pass the level V
Pass the level R
Pass the level P
Pass the level Q
Pass the level N
Pass the level O
Pass the level M
Pass the level K