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.
Collect 50 pieces of cheese.
Collect 30 pieces of cheese.
Collect 10 pieces of cheese.
Activate the game for 30 minutes.
Update your high score on the Road to Cheese.
Unlock 35 items from Lugh's information shop.
Knock down 3 GuBee's kings.
Defeat the GuBee's King.
Visit 50 areas.
Unlock 21 items from Lugh's information shop.
Maximum damage exceeds 99999.
Go into fever mode 10 times.
Knock down 20 boss-level monsters.
Increase the adventurer level to 300.
Release all outfits.
Release the ninja outfit.
Release the witch's outfit.
Release the spearman outfit.
Maximum damage exceeds 9999.
Release the cook's outfit.
Unlock 7 items from Lugh's information shop.
Increase the adventurer level to 200.
Collect a cumulative total of 100000 shards of stars.
Collect 23 achievement stamps.
Visit 25 areas.
Activate the game for 15 minutes.
Collect a cumulative total of 10000 shards of stars.
Knock down 100 monsters.
Increase the adventurer level to 100.
Start endless mode
Complete the story
Release the guardians of the Forgotten metropolis.
Informed Shiro what you want.
Discovering the Forgotten Forgotten capital.
Defeat the cave boss.
Knock down 50 monsters.
Encounter the researcher in the cave.
Out of the woods.
Strike 300 times.
Meet Suzu and become friends.
Defeat Rye in the woods.
Defeat Lev in the woods.
Clear the first area of the story.
Defeat the bear in the meadow.
Got your first shards of the star.
First time in fever state.