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