It’s an achievement whichever way you look at it (4)
I believe the answer is:
deed
I believe this is a double definition.
'it's an achievement' is the first definition.
(deed is a kind of achievement)
'whichever way you look at it' is the second definition.
(Other definitions for deed that I've seen before include "Action - legal document" , "What's done" , "Something done" , "Document showing ownership" , "Act - exploit - legal document" .)