If any of them didn't count on your world I recommend closing and reopening your game and visiting the npc's once again.

SUNRISE ISLE

• Turtle Friend - Terry the Turtle
  
• Squirrel Sanctuary - Maya
  
• Golden Acorn - Maya
  
• Sam's House Contractor - Sam
  
• The Way of the Cache - Mike
  
• Rock Smasher - Claire

THE FOREST NOOK

• Treasure Hunt - Molly
  
• Kingdom Clean - King Needlenose
  
• Bone Breaker - Patty the Archeologist
  
• Cannon Ball - Daredevil

FOUNTAIN SPRINGS

• The Fountain Rider - Tiff
  
• Lost in a Maze - Newt
  
• Magical Flowers - Liliana
  
• Whack a Weed - Ru
  
• Open Sesame - Holger the Nut

GREENLEAF SHADE

• The Grand Opening - Mr. Nibblesworth
  
• Chef Manny - Chef Manny
  
• Cleaning Operation - The Janitor
  
• Floor is Lava - Suzie

THE ASCENDED GARDENS

• The Pilgrimage - Risu
  
• House for Howard - Howard the Delicate
  
• Ascension - Mira
  
• A nice cup of tea - Hannah

Disclaimer: Sometimes the achievements work only on the first ever save you ever played, including the co-op one. So do not be surprised if you done all of the quests on another save but it did not count towards the achievement.

Enjoy collecting all the other achievements my fellow squirrels :)