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