Here is the full list of all 48 The Adventure of NAYU achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Visit 50 areas.
Collect 47 achievement stamps.
Unlock 35 items from Lugh's information shop.
Knock down 3 GuBee's kings.
Release the ninja outfit.
Release the witch's outfit.
Release all outfits.
Release the spearman outfit.
Release the cook's outfit.
Knock down 20 boss-level monsters.
Maximum damage exceeds 99999.
Unlock 21 items from Lugh's information shop.
Increase the adventurer level to 300.
Defeat the GuBee's King.
Collect a cumulative total of 100000 shards of stars.
Visit 25 areas.
Increase the adventurer level to 200.
Collect 50 pieces of cheese.
Update your high score on the Road to Cheese.
Collect 10 pieces of cheese.
Collect 30 pieces of cheese.
Knock down 100 monsters.
Maximum damage exceeds 9999.
Increase the adventurer level to 100.
Collect a cumulative total of 10000 shards of stars.
Collect 23 achievement stamps.
Unlock 7 items from Lugh's information shop.
Start endless mode
Release the guardians of the Forgotten metropolis.
Complete the story
Informed Shiro what you want.
Activate the game for 60 minutes.
Go into fever mode 10 times.
Discovering the Forgotten Forgotten capital.
Defeat the cave boss.
Activate the game for 30 minutes.
Knock down 50 monsters.
Encounter the researcher in the cave.
Out of the woods.
Activate the game for 15 minutes.
Strike 300 times.
Meet Suzu and become friends.
Defeat Rye in the woods.
Defeat Lev in the woods.
Clear the first area of the story.
Defeat the bear in the meadow.
Got your first shards of the star.
First time in fever state.