Here is the full list of all 25 Danmaku Unlimited 2 achievements.
Collect one trillion points.
Reach the rank of Major.
Reach the rank of Colonel.
Reach the rank of Ace.
Beat stage 5 in Classic Mode.
Complete the game in Classic Mode.
Beat the game with no weapon upgrades.
Beat stage 4 in Classic Mode.
Beat stage 3 in Classic Mode.
Beat stage 2 in Classic Mode.
Beat stage 1 in Classic Mode.
Complete the game in Burst Mode.
Defeat the True Boss.
Beat stage 5 in Burst Mode.
Reach the rank of Wing Commander.
Collect one billion points.
Reach the rank of Squadron Captain.
Reach the rank of Flight Lieutenant.
Reach of rank of Sergeant.
Reach the rank of Master Sergeant.
Beat stage 4 in Burst Mode.
Beat stage 3 in Burst Mode.
Collect 100 million points.
Beat stage 2 in Burst Mode.
Beat stage 1 in Burst Mode.