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