Here is the full list of all 41 Hyperdimension Neptunia Re;Birth2: Sisters Generation achievements.
Watched the True Ending.
Fought 500 battles.
All characters have attained Level 99.
Cleared Chapter 7.
Cleared Chapter 6.
Histoire joined the party.
Mina Nishizawa joined the party.
Kei Jinguji joined the party.
Chika Hakozaki joined the party.
Performed an 80-hit combo.
Discovered 200 Plans.
Defeated the hidden boss, Delphinus.
Inflicted over 100,000 points of damage.
Cleared Chapter 5.
Rom's and Ram's HDD versions have been powered up!
Uni's HDD version has been powered up!
Cleared Chapter 4.
Nepgear's HDD version has been powered up!
Cleared Chapter 3.
Fought 100 battles.
Created your first Game Disc.
Cleared Chapter 2.
Made use of Stella's ☆ Dungeon for the first time.
You have met Rom and Ram.
You have met Uni.
Created your own original combo setup.
Cleared Chapter 1.
Used the Remake System for the first time.
Engaged in your first random encounter.
You began your adventure.
You played so much, everyone now agrees that Nepgear is a good main character, too!
Obtained a total of 100 million Credits.
Cleared all Stella's ☆ Dungeon levels.
Watched the Normal Ending.
Watched the Human Ending.
Watched the Planeptune Ending.
Watched the Leanbox Ending.
Watched the Lastation Ending.
Watched the Lowee Ending.
Watched the Conquest Ending.
Watched the Holy Sword Ending.