Here is the full list of all 24 Danmaku Unlimited 3 achievements.
Completed Stage 2 in Spirit Mode.
Graze 1000 bullets in one chain
Completed Stage 1 in Spirit Mode.
Completed the tutorial for Spirit Mode.
Completed the tutorial for Graze Mode.
Cleared all stages in Spirit Mode.
Cleared all stages in Graze Mode.
Defeated the True Last Boss in Spirit Mode.
Defeated the True Last Boss in Graze Mode.
Scored 100 Million points.
Scored 1 Billion points.
Graze 3000 bullets in one chain
Graze 100,000 bullets
Flawlessly beat a boss.
Completed Stage 3 in Spirit Mode.
Completed Stage 4 in Spirit Mode.
Completed Stage 5 in Spirit Mode.
Completed Stage 1 in Graze Mode.
Completed Stage 2 in Graze Mode.
Completed Stage 3 in Graze Mode.
Completed Stage 4 in Graze Mode.
Completed Stage 5 in Graze Mode.
Max out the bomb counter.
Graze 10000 bullets in one chain