My most important achievement (is/was) being selected to an All-Star team.The concept "my most important achievement" is a current concept, which would thus be done via the present tense, yet the event itself was done in the past. It seems awkward to use either.
How about "My most important achievement has been my selection to an All-Star team"? )
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swampwizIt seems awkward to use either.It also seems awkward to call being selected an achievement. It seems to me that the achievement was something else, and it was that achievement that led to her being selected. I would either specify the real achievement or call the selection an honor.