Here is the full list of all 51 Nitroplus Blasterz: Heroines Infinite Duel achievements.
[TRAINING] Train for 5 minutes straight.
[ANOTHER STORY] Complete Episode 10
[ANOTHER STORY] Complete Episode 09.
[ANOTHER STORY] Complete Episode 06.
[ANOTHER STORY] Complete Episode 03.
Quick Combo: Hit the enemy with an A attack, B attack, and C attack in a row. (Offline only)
[ANOTHER STORY] Complete Episode 00.
[STORY] Defat the final boss.
Performed an Infinite Blast while guarding or being attacked 3 times. (Offline only)
[STORY] Complete Stage 7.
Cancelled attack and performed a Partner Blitz 3 times. (Offline only)
[STORY] Complete Stage 5.
Escape Action: Performed a small jump then hit the enemy with a jump attack. (Offline only)
Heavy Action: Held down the button long enough to trigger a Guard Crash 3 times. (Offline only)
Triggered a Counter 3 times. (Offline only)
Performed a Break-Fall or Mid-Air Recovery 3 times. (Offline only)
[STORY] Complete Stage 3.
Cancelled attack and performed an Infinite Blast 3 times. (Offline only)
Performed a Partner Blitz 3 times. (Offline only)
Escape Action: Cancelled attack and performed an escape action 3 times. (Offline only)
Escape Action: Performed a front dodge/mid-air dodge 3 times. (Offline only)
Defeat your opponent with a Variable Rush. (Offline only)
[STORY] View the opening movie.
You earned all other achievements.
[STORY] Defeat the final boss with all characters.
[SCORE ATTACK] Meet the last boss.
Performed a Counter Raid 3 times. (Offline only)
Blocked an attack with Vanishing Guard 3 times. (Mid-Air or Ground. Offline only)
Heavy Action: Hit the enemy with a foot sweep 3 times. (Offline only)
Cancelled throw and performed an escape action 3 times. (Mid-Air or Ground. Offline only)
Performed a Throw Escape 3 times. (Mid-Air or Ground. Offline only)
KO-ed the enemy with Akane Tsunemori's Eliminator. (Offline only)
KO-ed the enemy with Ein's Colt Python. (Offline only)
KO-ed the enemy with Mora's Child's Play. (Offline only)
Used more than 10 types of moves in 1 combo. (Offline only)
Performed more than 150 hits in 1 combo. (Offline only)
Used both Variable Rush and Lethal Blaze in 1 combo. (Offline only)
Used an Infinite Blast and 2 partners in 1 combo. (Offline only)
Dealt more than 12000 damage in 1 combo. (Offline only)
Used all partners. (Offline only)
KO-ed the enemy with Ein's Lethal Blaze. (Offline only)
KO-ed the enemy with Mora's Lethal Blaze. (Offline only)
KO-ed the enemy with Ruili's Lethal Blaze. (Offline only)
KO-ed the enemy with Al Azif's Lethal Blaze. (Offline only)
KO-ed the enemy with Saya's Lethal Blaze. (Offline only)
KO-ed the enemy with Ignis's Lethal Blaze. (Offline only)
KO-ed the enemy with Anna's Lethal Blaze. (Offline only)
KO-ed the enemy with Muramasa the 3rd's Lethal Blaze. (Offline only)
KO-ed the enemy with Ethica Kibanohara's Lethal Blaze. (Offline only)
KO-ed the enemy with Saber's Lethal Blaze. (Offline only)
KO-ed the enemy with Ouka's Lethal Blaze. (Offline only)