Here is the full list of all 41 Hyperdimension Neptunia Re;Birth2: Sisters Generation achievements.
Watched the Holy Sword Ending.
Watched the Planeptune Ending.
Watched the Lowee Ending.
Watched the Leanbox Ending.
Watched the Lastation Ending.
Watched the Human Ending.
Watched the True Ending.
Cleared Chapter 7.
All characters have attained Level 99.
Chika Hakozaki joined the party.
Kei Jinguji joined the party.
Cleared Chapter 6.
Watched the Normal Ending.
Histoire joined the party.
Mina Nishizawa joined the party.
Watched the Conquest Ending.
Cleared Chapter 5.
Rom's and Ram's HDD versions have been powered up!
Uni's HDD version has been powered up!
Made use of Stella's ☆ Dungeon for the first time.
Cleared Chapter 4.
Nepgear's HDD version has been powered up!
Cleared Chapter 3.
Inflicted over 100,000 points of damage.
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.
Used the Remake System for the first time.
You have met Uni.
Cleared Chapter 1.
Engaged in your first random encounter.
Created your own original combo setup.
You began your adventure.
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.
Cleared all Stella's ☆ Dungeon levels.
Defeated the hidden boss, Delphinus.