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