Here is the full list of all 41 NIER achievements worth 1,000 gamerscore. It takes around 60-80 hours to unlock all of the achievements on Xbox 360.
Kainé joined your party.
Complete 10 quests.
You killed 100 sheep.
You rode a boar for at least five minutes.
Grimoire Weiss joined your party.
Progress in the story to unlock this secret achievement.
Pull off a 50-hit combo.
Pull off a 100-hit combo.
Learn every type of magic.
Collect 50 percent of all words.
Find every weapon.
Complete 20 quests.
Complete 30 quests.
Accumulate 1,000,000 pieces of gold.
Read the final novel segment.
View the first ending.
View the second ending.
View the third ending.
View the fourth ending.
Successfully cultivate the legendary flower.
Catch a rhizodont.
Catch one of every type of fish.
Collect 50 types of raw materials.
Upgrade 5 weapons to their maximum level.
Upgrade 15 weapons to their maximum level.
Upgrade 30 weapons to their maximum level.
Complete the game within fifteen hours.
Defeat a certain boss within two and a half minutes.
Defeat a certain boss within one minute.
Defeat a certain boss within four and a half minutes.
Defeat a certain boss within eight and a half minutes.
Defeat a certain boss within three and a half minutes.
Defeat a certain boss within two minutes.
Defeat a certain boss within one and a half minutes.