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.
Release the cook's outfit.
Release the spearman outfit.
Release all outfits.
Release the ninja outfit.
Release the witch's outfit.
Unlock 35 items from Lugh's information shop.
Knock down 3 GuBee's kings.
Unlock 21 items from Lugh's information shop.
Defeat the GuBee's King.
Activate the game for 30 minutes.
Maximum damage exceeds 99999.
Increase the adventurer level to 300.
Knock down 20 boss-level monsters.
Increase the adventurer level to 200.
Visit 25 areas.
Unlock 7 items from Lugh's information shop.
Maximum damage exceeds 9999.
Knock down 100 monsters.
Increase the adventurer level to 100.
Collect a cumulative total of 100000 shards of stars.
Collect a cumulative total of 10000 shards of stars.
Start endless mode
Collect 23 achievement stamps.
Collect 10 pieces of cheese.
Collect 30 pieces of cheese.
Collect 50 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.
Go into fever mode 10 times.
Discovering the Forgotten Forgotten capital.
Defeat the cave boss.
Knock down 50 monsters.
Encounter the researcher in the cave.
Strike 300 times.
Out of the woods.
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.
First time in fever state.
Got your first shards of the star.