世界を救う第一歩！ Trophy in VVVtunia
How to unlock 世界を救う第一歩！[First Step to Rescue the World!]
[Cleared chapter 2.]
For this trophy, you will want to clear Episode 2, which consists of getting through the other half of NeoTube to ultimately face the end-boss of the dungeon in another MV Battle.
This episode should not give much issue, though the boss here is a bit more difficult than the previous boss as it has some tricky attacks to avoid. The two main attacks you will want to keep in mind are its spinning top attack where it will chase you down at high speed for a bit and its rotation attack where it will start from the edge of the arena and spin around to the center of the arena before stopping. To deal with the spinning attack, it is recommended that you start to move away from the boss when it performs the tell for this attack (when it starts to tilt to its side) and then either start dashing away (VTuber) or activate your boost (CPU) while continuing to move away from it and move off to the side. While it will still manage to get close to you, it should not be able to close the distance before it stops attacking if you did it right. As for the rotation attack, this is actually not too hard to avoid for the most part as long as you stay to the edge of the arena since as long as it doesn't land on you while starting the attack, it will move away from the edge of the arena very quickly and therefore not contact you at all.
The boss also has an attack where it will rise up slowly and perform an explosion that covers the entire field. There is no real way to avoid this but you can use the time when it is charging the attack to do any healing. I also recommend switching to the CPUs to handle this attack since it will just do 1 HP of damage to them, which is very easy to heal compared to whatever damage a VTuber would sustain from the attack.