Full list of all 33 Island Saver achievements. It takes around 8-10 hours to unlock all of the achievements in the base game on Windows.
The base game contains 13 achievements, and there is 1 DLC pack containing 20 achievements.
Open the Electric Gate
Use T-Rex to smash amber
Ride on an Ankylosaurus
Ride on a Velociraptor
Insert battery into Giant Tax Bot
Feed a flying Pteranodon
Help Newton repay all his debts
Build tax bridge
Collect a piece of broken Exit Bot
Find all Newton's lost fossils
Help smoothie stall re-open for business
Use a magic portal
Smash a wooden crate
Glide on a dragon
Build portal pipe on Hub Island
Paint both billboards on Oasis Island
Plant a giant beanstalk
Find Truffles's lost dog
Award all fruit supply contracts
Find all the Golden Goose eggs