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.
Kei Jinguji joined the party.
Cleared Chapter 7.
Cleared Chapter 6.
Watched the Lowee Ending.
Mina Nishizawa joined the party.
Watched the Lastation Ending.
Chika Hakozaki joined the party.
Watched the Leanbox Ending.
Histoire joined the party.
Watched the Holy Sword Ending.
Watched the Conquest Ending.
Watched the Planeptune Ending.
Watched the Human 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!
Cleared Chapter 4.
Nepgear's HDD version has been powered up!
Cleared Chapter 3.
Fought 500 battles.
Inflicted over 100,000 points of damage.
Cleared Chapter 2.
Performed an 80-hit combo.
Created your first Game Disc.
You have met Rom and Ram.
Fought 100 battles.
Made use of Stella's ☆ Dungeon for the first time.
You have met Uni.
Cleared Chapter 1.
Used the Remake System for the first time.
Created your own original combo setup.
Engaged in your first random encounter.
You began your adventure.