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