Here is the full list of all 12 Hike Isle achievements.
Finished the game!
Discovered the Tower
Discovered the Timberyard
Discovered the Campsite
Discovered the Magic Mushroom
Discovered the Lonely Tent
Discovered the Hunters Shack
Discovered the Broken Property
Discovered the Mansion
Discovered the Boatyard
Discovered the Hunters Tent
Start the game!