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