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.
Defeated the hidden boss, Delphinus.
All characters have attained Level 99.
Discovered 200 Plans.
Watched the True Ending.
Cleared Chapter 7.
Kei Jinguji joined the party.
Cleared Chapter 6.
Watched the Human Ending.
Watched the Lastation Ending.
Watched the Lowee Ending.
Mina Nishizawa joined the party.
Watched the Leanbox Ending.
Chika Hakozaki joined the party.
Watched the Planeptune Ending.
Histoire joined the party.
Watched the Normal Ending.
Watched the Holy Sword Ending.
Watched the Conquest Ending.
Cleared Chapter 5.
Rom's and Ram's HDD versions have been powered up!
Performed an 80-hit combo.
Fought 500 battles.
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.
Created your first Game Disc.
Made use of Stella's ☆ Dungeon for the first time.
You have met Uni.
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.