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