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.
Visit 50 areas.
Knock down 3 GuBee's kings.
Defeat the GuBee's King.
Release all outfits.
Release the ninja outfit.
Release the witch's outfit.
Unlock 21 items from Lugh's information shop.
Unlock 35 items from Lugh's information shop.
Release the spearman outfit.
Knock down 20 boss-level monsters.
Release the cook's outfit.
Maximum damage exceeds 99999.
Increase the adventurer level to 300.
Increase the adventurer level to 200.
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.
Collect 50 pieces of cheese.
Increase the adventurer level to 100.
Unlock 7 items from Lugh's information shop.
Start endless mode
Collect 23 achievement stamps.
Collect 10 pieces of cheese.
Collect 30 pieces of cheese.
Update your high score on the Road to Cheese.
Complete the story
Release the guardians of the Forgotten metropolis.
Informed Shiro what you want.
Activate the game for 30 minutes.
Discovering the Forgotten Forgotten capital.
Go into fever mode 10 times.
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.