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!
All characters have attained Level 99.
Kei Jinguji joined the party.
Cleared all Stella's ☆ Dungeon levels.
Discovered 200 Plans.
Obtained a total of 100 million Credits.
Defeated the hidden boss, Delphinus.
Watched the True Ending.
Cleared Chapter 7.
Histoire joined the party.
Mina Nishizawa joined the party.
Cleared Chapter 6.
Watched the Human Ending.
Watched the Lowee Ending.
Watched the Lastation Ending.
Watched the Planeptune Ending.
Watched the Leanbox Ending.
Chika Hakozaki joined the party.
Watched the Normal Ending.
Watched the Holy Sword Ending.
Watched the Conquest Ending.
Cleared Chapter 5.
Fought 500 battles.
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!
Cleared Chapter 3.
Cleared Chapter 2.
Inflicted over 100,000 points of damage.
You have met Rom and Ram.
Created your first Game Disc.
Performed an 80-hit combo.
Fought 100 battles.
Made use of Stella's ☆ Dungeon for the first time.
You have met Uni.
Used the Remake System for the first time.
Cleared Chapter 1.
Created your own original combo setup.
Engaged in your first random encounter.
You began your adventure.