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