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.
Pull off a 100-hit combo.
Accumulate 1,000,000 pieces of gold.
You successfully cultivated the legendary flower.
Find every weapon.
Defeat a berserking Shade within one minute.
Defeat Gretel within two and a half minutes.
Collect 50 percent of all words.
You viewed the second ending (Ending B).
Destroy the world-saving tome within one and a half minutes.
Defeat the betrayers again within three and a half minutes.
Defeat Goose within two minutes.
Defeat the betrayers within two and a half minutes.
Complete 30 quests.
Defeat Roc within three and a half minutes.
Defeat P-33 within four and a half minutes.
Defeat Wendy within eight and a half minutes.
Complete 20 quests.
You caught a rhizodont.
You caught one of every type of fish.
Complete 10 quests.
You collected 50 types of raw materials.
Read the final novel segment.
You completed the game within fifteen hours.
You viewed the first ending (Ending A).
You defeated the Shadowlord.
You unlocked the key to the Shadowlord's castle.
You freed Kainé from her petrification.
Emil joined your party.
Learn every type of magic.
You rode a boar for at least five minutes.
Kainé joined your party.
Grimoire Weiss joined your party.
You killed 100 sheep.
Pull off a 50-hit combo.
View the third ending.
View the fourth ending.
Upgrade 5 weapons to their maximum level.
Upgrade 15 weapons to their maximum level.
Upgrade 30 weapons to their maximum level.
Defeat a certain boss within three and a half minutes.