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