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