Here is the full list of all 41 Hyperdimension Neptunia Re;Birth2: Sisters Generation achievements.
Watched the True Ending.
Cleared Chapter 7.
Cleared Chapter 6.
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!
Fought 500 battles.
Created your first Game Disc.
Uni's HDD version has been powered up!
Cleared Chapter 4.
Nepgear's HDD version has been powered up!
Cleared Chapter 3.
Inflicted over 100,000 points of damage.
Performed an 80-hit combo.
Cleared Chapter 2.
You have met Rom and Ram.
Fought 100 battles.
You have met Uni.
Cleared Chapter 1.
Made use of Stella's ☆ Dungeon for the first time.
Used the Remake System for the first time.
Engaged in your first random encounter.
Created your own original combo setup.
You began your adventure.
You played so much, everyone now agrees that Nepgear is a good main character, too!
Obtained a total of 100 million Credits.
All characters have attained Level 99.
Discovered 200 Plans.
Cleared all Stella's ☆ Dungeon levels.
Histoire joined the party.
Kei Jinguji joined the party.
Mina Nishizawa joined the party.
Chika Hakozaki joined the party.
Watched the Human Ending.
Watched the Planeptune Ending.
Watched the Leanbox Ending.
Watched the Lastation Ending.
Watched the Lowee Ending.
Defeated the hidden boss, Delphinus.