Here is the full list of all 29 Bullet Hell Monday: Black achievements.
Completed the tutorial.
Played Black mode.
Cleared Black 1 without using continues.
Cleared Black 2 without using continues.
Cleared Black 3 without using continues.
Cleared Black 4 without using continues.
Cleared Black 5 without using continues.
Cleared Black ALL without using continues (Normal or above).
Cleared Black ALL on Heaven difficulty without using continues.
Achieved U++ grade in Black 1.
Achieved U++ grade in Black 2.
Achieved U++ grade in Black 3.
Achieved U++ grade in Black 4.
Achieved U++ grade in Black 5.
Achieved U++ grade in Black ALL.
Cleared Black IF ALL without using continues.
Cleared Black IF ALL on Heaven difficulty without using continues.
Played Extra mode.
Achieved U++ grade in Extra mode.
Survived for over 30 minutes in Extra mode.
Reached 200% game speed in Extra mode.
Achieved A grade or higher.
Achieved S grade or higher.
Achieved U grade or higher.
Cleared without losing any lives (Black, any stage, Normal or above).
Cleared without using bombs (Black, any stage, Normal or above).
Cleared with No Deaths and No Bombs (Black, any stage, Normal or above).
Got an extra life.
Reached a score multiplier of 9999.9%.