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I'll assume that you want to echo any literal Set operation that occurs in input, even if it is not on a line by itself.

This may work for you:

$Pre =
 Function[
   main,
   Unevaluated[main] /. Set -> Function[, Print@HoldForm[# = #2]; # = #2, HoldFirst],
   HoldAll
 ];

Now:

{a = 2 + 2, b = 10/2, c = Sqrt[9]};

a = 4

b = 5

c = 3

{a, b, c}

{4, 5, 3}