English Translation
They reached the target.
It should be reached not hit.
English Translation
They hit the target.
“hit“ is one of the definitions given by reverso.net for atteindre:
reach, achieve, meet, attain, get, accomplish, hit, fulfil, grow
At atteindre - traduction - Dictionnaire Français-Anglais WordReference.com,
atteindre sa cible = hit your target, hit the mark