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