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 True Ending.
Obtained a total of 100 million Credits.
Defeated the hidden boss, Delphinus.
Cleared Chapter 7.
All characters have attained Level 99.
Kei Jinguji joined the party.
Chika Hakozaki joined the party.
Discovered 200 Plans.
Mina Nishizawa joined the party.
Histoire joined the party.
Cleared Chapter 6.
Watched the Human Ending.
Watched the Planeptune Ending.
Watched the Lowee Ending.
Watched the Lastation Ending.
Watched the Leanbox Ending.
Watched the Normal Ending.
Performed an 80-hit combo.
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!
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.
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.
Created your own original combo setup.
Engaged in your first random encounter.
You began your adventure.