R-Type Final 2 (JP)

This achievement has an incredibly oblique description. There are some conditions you have to satisfy in order to get this one, but I'm not yet sure exactly which ones are important.

First of all, there is no ship called "Into The Dusk" (at least, not yet), but the makers of the game put out this tweet in December 2021:



The achievement description suggests that you should use one of these ships.
(in case the tweet image disappears, the ships mentioned are "R-9A2 DELTA, RX-10 ALBATROSS, R-13A CERBERUS, TP-2 POW ARMOR, Snake-like Craft CONTRITE"

So I used the ALBATROSS and completed the level, but no achievement.

Then after some asking around, it was suggested to me that you have to kill all the blue monsters in this stage by destroying their "spiky end" first.

So I did this, and yes, I got the achievement, in Score Attack mode, Practice difficulty.
But during this attempt, I also destroyed the large armoured floating creature, and didn't die, so that might be important.

So, in summary, to be on the safe side you should:
1) complete stage Z6.0 on any difficulty
2) don't lose any lives
3) use one of the ships mentioned in that tweet
4) destroy the blue monsters in two stages, spiky-end first
5) destroy the large armoured floating creature

If you can eliminate any of those conditions, let me know and I'll update this.