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