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