Yes, TARGETS is a Scrabble word!

Letter values in Scrabble US: T 1, A 1, R 1, G 2, E 1, T 1, S 1.

Is it a valid word?

TARGETS is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

a reference point to shoot at
a person who is the aim of an attack (especially a victim of ridicule or exploitation) by some hostile person or influence
the location of the target that is to be hit
sports equipment consisting of an object set up for a marksman or archer to aim at
the goal intended to be attained (and which is believed to be attainable)

Also: fair game, target area.