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