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.
Watched the Leanbox Ending.
All characters have attained Level 99.
Kei Jinguji joined the party.
Watched the Human Ending.
Watched the Holy Sword Ending.
Watched the Lastation Ending.
Watched the Conquest Ending.
Discovered 200 Plans.
Defeated the hidden boss, Delphinus.
Watched the True Ending.
Cleared Chapter 7.
Cleared Chapter 6.
Histoire joined the party.
Watched the Planeptune Ending.
Watched the Lowee Ending.
Mina Nishizawa joined the party.
Chika Hakozaki joined the party.
Fought 500 battles.
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!
Inflicted over 100,000 points of damage.
Cleared Chapter 3.
Created your first Game Disc.
Performed an 80-hit combo.
Cleared Chapter 2.
Fought 100 battles.
You have met Rom and Ram.
You have met Uni.
Cleared Chapter 1.
Made use of Stella's ☆ Dungeon for the first time.
Created your own original combo setup.
Used the Remake System for the first time.
Engaged in your first random encounter.
You began your adventure.