Here is the full list of all 52 Bullet Hell Monday achievements.
Cleared Challenge ALL with only the Blade type. (1CC, Normal or above)
Cleared Challenge ALL with only the Lock-On type. (1CC, Normal or above)
Cleared Challenge ALL with only the Search type. (1CC, Normal or above)
Cleared Challenge ALL with only the Time type. (1CC, Normal or above)
Cleared Challenge ALL with only the Phantom type. (1CC, Normal or above)
Cleared Challenge ALL with only the Homing type. (1CC, Normal or above)
Cleared Challenge ALL with only the Wide type. (1CC, Normal or above)
Cleared Challenge ALL with only the Laser type. (1CC, Normal or above)
Cleared without using bombs. (Challenge, any stage, Normal or above)
Cleared with No Deaths and No Bombs. (Challenge, any stage, Normal or above)
Cleared Challenge ALL with only the Shielding type. (1CC, Normal or above)
Obtained grade U++ in Challenge ALL.
Obtained grade U++ in Challenge 5.
Obtained grade U++ in Challenge 4.
Obtained grade U++ in Challenge 3.
Obtained grade U++ in Challenge 2.
Obtained grade U++ in Challenge 1.
Survived for more than 30 minutes in Accel 2.
Obtained grade U++ in Accel 1.
Survived for more than 30 minutes in Endless 2.
Survived for more than 60 minutes in Extra mode. (Any stage)
Obtained grade U++ in Endless 1.
Obtained grade U or higher in Challenge or Extra mode.
Reached a score multiplier of 9999.9%.
Played Extra mode.
Cleared Challenge ALL without using continues. (Normal or above)
Cleared Challenge ALL on Heaven difficulty without using continues.
Cleared Challenge 5 without using continues.
Cleared Challenge 4 without using continues.
Cleared Challenge 2 without using continues.
Cleared Challenge 3 without using continues.
Cleared Challenge 1 without using continues.
Obtained grade A or higher in Challenge or Extra mode.
Obtained grade S or higher in Challenge or Extra mode.
Cleared without losing a life. (Challenge, any stage, Normal or above)
Got an extra life.
Played Challenge mode.
Completed all missions in Chapter mode.
Completed all missions in Chapter 5.
Completed all missions in Chapter 4.
Completed all missions in Chapter 3.
Cleared Chapter mode.
Cleared Chapter 5.
Completed all missions in Chapter 2.
Cleared Chapter 4.
Cleared 404 in Chapter 4.
Cleared Chapter 3.
Completed all missions in Chapter 1.
Cleared Chapter 2.
Cleared Chapter 1.
Played Chapter mode.
Completed the tutorial.