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