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!
Obtained a total of 100 million Credits.
Watched the True Ending.
Cleared all Stella's ☆ Dungeon levels.
Defeated the hidden boss, Delphinus.
Cleared Chapter 7.
All characters have attained Level 99.
Discovered 200 Plans.
Kei Jinguji joined the party.
Histoire joined the party.
Watched the Holy Sword Ending.
Watched the Human Ending.
Cleared Chapter 6.
Watched the Planeptune Ending.
Watched the Lastation Ending.
Watched the Lowee Ending.
Mina Nishizawa joined the party.
Watched the Leanbox Ending.
Chika Hakozaki joined the party.
Watched the Normal Ending.
Watched the Conquest Ending.
Cleared Chapter 5.
Rom's and Ram's HDD versions have been powered up!
Fought 500 battles.
Uni's HDD version has been powered up!
Inflicted over 100,000 points of damage.
Cleared Chapter 4.
Nepgear's HDD version has been powered up!
Cleared Chapter 3.
Created your first Game Disc.
Performed an 80-hit combo.
Cleared Chapter 2.
You have met Rom and Ram.
Fought 100 battles.
You have met Uni.
Cleared Chapter 1.
Created your own original combo setup.
Made use of Stella's ☆ Dungeon for the first time.
Used the Remake System for the first time.
Engaged in your first random encounter.
You began your adventure.