Here is the full list of all 25 Hotel Transylvania 3: Monsters Overboard achievements worth 1,000 gamerscore.
Congratulations! You’ve done all there is to do in Hotel Transylvania 3: Monsters Overboard!
Hit an enemy with a ricocheted Mummimpa.
Have 30 Vampimpa at once for more than 5 seconds.
Defeat the Dastardly Dragon and retrieve the final part of Neptune's Compass.
Unlock every single Impa Portal.
Collected every single Treasure hidden in the Lost Islands.
Collect half of the Treasures hidden in the Lost Islands.
Defeat any enemy other than a Feeble Flower with nothing but a single Wolfimpa.
Defeat an enemy with the impact from a thrown Frankenimpa.
Use Mummimpa's Magic Sand to block the smell trail from a Stinkbulb.
Have 5 of each Impa type at once for more than 5 seconds.
Rescued Murray.
Defeat the Cruel Crustacean and retrieve the second part of Neptune's Compass.
You've successfully liberated 3 objects from Giant Clams.
Rescued Frank.
Unlock half of all Impa Portals.
Defeat the Fiendish Flower and retrieve the first part of Neptune's Compass.
You've collected the first of many treasures.
You've safely retrieved an object from an angry Giant Clam.
Rescued Wayne.
You've defeated 5 enemies in a single night.
Defeat a Coconut Crab while it's stunned.
You've collected 5 Imparite Stones in a single night.
Unlock the third Impa Portal.
Complete the tutorial and meet up with Ericka, Johnny and Dennis.