(As for now, I've only got platinum on stage 2 only for a several times, so not very confident about it. This guide is yet on draft. Still, I think it might be of some use.)
Stage 2 BanchouEarn a platinum medal on stage 2 of Banchou mode.
To unlock this achievement, you have to earn a platinum medal (the best rating) on playing stage 2 of Banchou mode. This must be done on Banchou mode. The achievement won't unlock even if you got platinum on stage 2 while playing the normal mode.
If you haven't got Stage 1 Banchou, please try that first. This achievement is clearly harder than stage 1.
(platinum on Banchou stage 1)
To make it simple, here I assume you've read through my solution on the achievement above.
Conditions for the platinumA Japanese magazine Famitsu Xbox 360 has shown the detailed condition for the platinum medal.
Not died, got 80% of in-stage bonuses and earned a certain value of Soul Gauge multiplier (40 for this stage).
(Drawn from p.112 of the June 2011 issue of Famitsu Xbox 360.)
Also thanks to this knowledge, we can have a more detailed analysis of why you fail to get platinum.
1. If you died twice or more - try again and don't die!
2. If you died once (or didn't die) and got silver - you need to get more in-stage bonuses.
3. If you died once and got gold - you got sufficient in-stage bonuses. Try not to die next time.
4. If you didn't die and got gold - you need more multiplier. Fight aggressively!
In-stage bonusesA quick-fix list of in-stage bonuses. There are a total of 19 in this stage.
Destruction secret bonus - 10,000 pts. x3For destroying asteroids with turrets. Hard to miss.
Special bonus - 20,000 pts.By destroying all asteroids, including the small ones.
(Thanks to cra x360a for pointing out this.)
On asteroid base.
Mystery bonuses x2OTSU bonuses. See
その名は「乙」! in Bullet Soul (JP) . There are two of them before the mini-boss fight.
Destruction bonuses x3Base split bonuses. See
基地分断 in Bullet Soul (JP) . There are three of them before the mini-boss fight.
Mini-boss fight.
Mystery bonusAnother OTSU, usually during the mini-boss fight.
Boss parts destruction special bonus - 30,000 pts.By destroying all parts of mini-boss.
Mystery bonuses x3Three OTSU after the mini-boss fight.
Destruction bonusOne base split after the mini-boss fight.
Juggleon special bonus - 80,000 pts.See
同時破壊 in Bullet Soul (JP) for details.
Elimination special bonus - 20,000 pts.By destroying all mid-sized enemies.
Juggleon special bonus - 80,000 pts.Another Juggleon pair.
Boss parts destruction special bonus - 100,000 pts.By destroying all parts of the boss.