White lance is much easier just to use two Moonblades and a quick mech to boost past everything and blade the white ship. It took me less than 30 seconds to complete the mission with almost no damage taken on hard.
Also the SIRIUS cannons are much better for fighting the fast-moving mechs on a few stages than the OGOTOs as suggested here.
Landed on exactly 500,000/500,000gs with exactly 18500 achievements and exactly 500 games. All 100% including DLC. Was going hard the first half of January to reach that goal! Finished it on 1-19-2016. Final achievement: Completion Serenity in Nero.