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.
Collect 50 pieces of cheese.
Collect 47 achievement stamps.
Collect 10 pieces of cheese.
Collect 30 pieces of cheese.
Update your high score on the Road to Cheese.
Activate the game for 60 minutes.
Release all outfits.
Release the ninja outfit.
Release the witch's outfit.
Release the spearman outfit.
Release the cook's outfit.
Unlock 35 items from Lugh's information shop.
Visit 50 areas.
Knock down 3 GuBee's kings.
Knock down 20 boss-level monsters.
Unlock 21 items from Lugh's information shop.
Maximum damage exceeds 99999.
Increase the adventurer level to 300.
Collect a cumulative total of 100000 shards of stars.
Increase the adventurer level to 200.
Visit 25 areas.
Defeat the GuBee's King.
Maximum damage exceeds 9999.
Collect a cumulative total of 10000 shards of stars.
Knock down 100 monsters.
Collect 23 achievement stamps.
Increase the adventurer level to 100.
Go into fever mode 10 times.
Unlock 7 items from Lugh's information shop.
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.
Activate the game for 30 minutes.
Knock down 50 monsters.
Encounter the researcher in the cave.
Out of the woods.
Activate the game for 15 minutes.
Meet Suzu and become friends.
Strike 300 times.
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.