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