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.
Knock down 3 GuBee's kings.
Collect 47 achievement stamps.
Visit 50 areas.
Unlock 35 items from Lugh's information shop.
Collect 10 pieces of cheese.
Collect 30 pieces of cheese.
Collect 50 pieces of cheese.
Knock down 20 boss-level monsters.
Update your high score on the Road to Cheese.
Defeat the GuBee's King.
Maximum damage exceeds 99999.
Unlock 21 items from Lugh's information shop.
Activate the game for 60 minutes.
Release the witch's outfit.
Increase the adventurer level to 300.
Visit 25 areas.
Maximum damage exceeds 9999.
Unlock 7 items from Lugh's information shop.
Increase the adventurer level to 200.
Release all outfits.
Collect a cumulative total of 100000 shards of stars.
Release the ninja outfit.
Release the spearman outfit.
Knock down 100 monsters.
Release the cook's outfit.
Increase the adventurer level to 100.
Collect 23 achievement stamps.
Start endless mode
Collect a cumulative total of 10000 shards of stars.
Complete the story
Release the guardians of the Forgotten metropolis.
Informed Shiro what you want.
Activate the game for 30 minutes.
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.
Activate the game for 15 minutes.
Meet Suzu and become friends.
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.