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 Holy Sword Ending.
Obtained a total of 100 million Credits.
Defeated the hidden boss, Delphinus.
Watched the True Ending.
Cleared Chapter 7.
Discovered 200 Plans.
All characters have attained Level 99.
Kei Jinguji joined the party.
Cleared Chapter 6.
Watched the Human Ending.
Watched the Lastation Ending.
Watched the Leanbox Ending.
Watched the Lowee Ending.
Mina Nishizawa joined the party.
Watched the Planeptune Ending.
Histoire joined the party.
Fought 500 battles.
Watched the Conquest Ending.
Watched the Normal Ending.
Chika Hakozaki joined the party.
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!
Performed an 80-hit combo.
Cleared Chapter 3.
Fought 100 battles.
Cleared Chapter 2.
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.
Created your own original combo setup.
Used the Remake System for the first time.
Engaged in your first random encounter.
You began your adventure.