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