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!
Obtained a total of 100 million Credits.
Discovered 200 Plans.
Watched the Lastation Ending.
Cleared all Stella's ☆ Dungeon levels.
Defeated the hidden boss, Delphinus.
All characters have attained Level 99.
Kei Jinguji joined the party.
Watched the Human Ending.
Watched the Lowee Ending.
Mina Nishizawa joined the party.
Watched the Leanbox Ending.
Chika Hakozaki joined the party.
Watched the Planeptune Ending.
Watched the True Ending.
Cleared Chapter 7.
Cleared Chapter 6.
Histoire joined the party.
Watched the Holy Sword Ending.
Created your first Game Disc.
Watched the Conquest Ending.
Fought 500 battles.
Watched the Normal Ending.
Cleared Chapter 5.
Rom's and Ram's HDD versions have been powered up!
Performed an 80-hit combo.
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.
Cleared Chapter 2.
You have met Rom and Ram.
Fought 100 battles.
You have met Uni.
Made use of Stella's ☆ Dungeon for the first time.
Used the Remake System for the first time.
Cleared Chapter 1.
Engaged in your first random encounter.
Created your own original combo setup.
You began your adventure.