Arriving or attaining (8)
I believe the answer is:
reaching
I believe this is a double definition.
'arriving' is the first definition.
(reaching is a kind of arriving)
'attaining' is the second definition.
('reach' can be a synonym of 'attain')
(Other definitions for reaching that I've seen before include "Arriving at, attaining" , "Arriving at a place" , "Connecting" , "Contacting" , "Arriving at a destination or a goal" .)