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.
Discovered 200 Plans.
Watched the True Ending.
Cleared Chapter 7.
Obtained a total of 100 million Credits.
Defeated the hidden boss, Delphinus.
All characters have attained Level 99.
Kei Jinguji joined the party.
Cleared Chapter 6.
Watched the Planeptune Ending.
Histoire joined the party.
Watched the Human Ending.
Watched the Lastation Ending.
Watched the Leanbox Ending.
Chika Hakozaki joined the party.
Mina Nishizawa joined the party.
Watched the Lowee Ending.
Watched the Normal Ending.
Watched the Holy Sword Ending.
Created your first Game Disc.
Watched the Conquest Ending.
Cleared Chapter 5.
Fought 500 battles.
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.
Inflicted over 100,000 points of damage.
Performed an 80-hit combo.
Cleared Chapter 2.
You have met Rom and Ram.
Fought 100 battles.
You have met Uni.
Cleared Chapter 1.
Made use of Stella's ☆ Dungeon for the first time.
Used the Remake System for the first time.
Engaged in your first random encounter.
Created your own original combo setup.
You began your adventure.