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.
Visit 50 areas.
Knock down 3 GuBee's kings.
Collect 47 achievement stamps.
Unlock 35 items from Lugh's information shop.
Defeat the GuBee's King.
Knock down 20 boss-level monsters.
Maximum damage exceeds 99999.
Unlock 21 items from Lugh's information shop.
Release the witch's outfit.
Release all outfits.
Increase the adventurer level to 300.
Visit 25 areas.
Maximum damage exceeds 9999.
Release the ninja outfit.
Release the spearman outfit.
Release the cook's outfit.
Increase the adventurer level to 200.
Collect a cumulative total of 100000 shards of stars.
Knock down 100 monsters.
Unlock 7 items from Lugh's information shop.
Increase the adventurer level to 100.
Collect a cumulative total of 10000 shards of stars.
Start endless mode
Collect 50 pieces of cheese.
Collect 10 pieces of cheese.
Collect 30 pieces of cheese.
Collect 23 achievement stamps.
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 60 minutes.
Discovering the Forgotten Forgotten capital.
Defeat the cave boss.
Strike 300 times.
Knock down 50 monsters.
Go into fever mode 10 times.
Out of the woods.
Encounter the researcher in the cave.
Activate the game for 30 minutes.
Meet Suzu and become friends.
Activate the game for 15 minutes.
Defeat Rye in the woods.
Defeat Lev in the woods.
Defeat the bear in the meadow.
Clear the first area of the story.
Got your first shards of the star.
First time in fever state.