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.
All characters have attained Level 99.
Watched the Planeptune Ending.
Histoire joined the party.
Mina Nishizawa joined the party.
Kei Jinguji joined the party.
Watched the Lastation Ending.
Watched the Lowee Ending.
Watched the Leanbox Ending.
Chika Hakozaki joined the party.
Watched the Human Ending.
Watched the Normal Ending.
Cleared all Stella's ☆ Dungeon levels.
Watched the Holy Sword Ending.
Watched the Conquest Ending.
Defeated the hidden boss, Delphinus.
Watched the True Ending.
Cleared Chapter 7.
Cleared Chapter 6.
Cleared Chapter 5.
Rom's and Ram's HDD versions have been powered up!
Uni's HDD version has been powered up!
Fought 500 battles.
Inflicted over 100,000 points of damage.
Cleared Chapter 4.
Nepgear's HDD version has been powered up!
Cleared Chapter 3.
Performed an 80-hit combo.
Cleared Chapter 2.
You have met Rom and Ram.
Created your first Game Disc.
You have met Uni.
Cleared Chapter 1.
Fought 100 battles.
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.