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