Here is the full list of all 20 DuckTales Remastered (Arcade) achievements worth 400 gamerscore.
Unlock all art in the Gallery
Beat game on Extreme difficulty
Enter the underground section of Amazon and climb up the other side using only the pogo jump.
Beat game on Hard difficulty
Collect All the Heart Containers on Easy or Medium difficulty
Defeat 5 enemies under the effect of 1 magic coin
Scrooge doesn't take kindly to being swindled by statues
Get back what Magica stole
Buy art in the gallery
Defeat 5 enemies in a row with pogo jump without touching the ground
Collect the Green Cheese of Longevity
Collect $10,000,000
Get to the secret gyro area in the clouds
Collect the Lost Crown of Ghengis Khan
Collect the Giant Diamond of Inner Earth
Collect the Coin of the Lost Realm
Dive into the Money Bin
Collect the Sceptre of the Incan King
Eat some of Mrs. Beakley's delicious treats.
Defeat Big Time Beagle using your noggin