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