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