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