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.
Watched the Holy Sword Ending.
Obtained a total of 100 million Credits.
Cleared Chapter 7.
Defeated the hidden boss, Delphinus.
All characters have attained Level 99.
Discovered 200 Plans.
Kei Jinguji joined the party.
Watched the True Ending.
Cleared Chapter 6.
Watched the Conquest Ending.
Watched the Leanbox Ending.
Chika Hakozaki joined the party.
Watched the Lastation Ending.
Watched the Lowee Ending.
Mina Nishizawa joined the party.
Watched the Planeptune Ending.
Histoire joined the party.
Performed an 80-hit combo.
Watched the Human Ending.
Fought 500 battles.
Watched the Normal Ending.
Cleared Chapter 5.
Rom's and Ram's HDD versions have been powered up!
Inflicted over 100,000 points of damage.
Uni's HDD version has been powered up!
Cleared Chapter 4.
Nepgear's HDD version has been powered up!
Cleared Chapter 3.
Cleared Chapter 2.
Fought 100 battles.
Created your first Game Disc.
You have met Rom and Ram.
Made use of Stella's ☆ Dungeon for the first time.
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.