Unless your Champion's basic attack is hitscan, like Viktor or Tyra, you'll be hard-pressed to hit Androxus while he's airborne. Wait for him to land, if you can.
Androxus is great at short distance but he also can do much from long distance. The best way to counter him is bait him to use Reversal unnecessarily and force him to waste all Nether Steps and just stay grouped up.
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Map Brightmarsh. You can dash over the Roof where the capturepoint is. Good to surprise and flank someone from behind/above. Also works with Evie,Drogoz,Maeve maybe even Willo (didnt tryed with willo yet)
Strafe around unpredictability. Makes you much harder to aim at. Create angles with team mates so he can't hide behind cover to stop all damage. Don't try to 1v1.