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