Here is the full list of all 32 ARK: Survival Evolved achievements. It takes around 200 hours to unlock all of the achievements on Windows.
You defeated the Guardians of The Center!
You tamed all of the domesticable creatures on the ARK!
You've discovered 100% of the Explorer Notes on the ARK!
You've discovered 90% of the Explorer Notes on the ARK!
You've discovered 80% of the Explorer Notes on the ARK!
You Ascended off the ARK, at Alpha level!
You've discovered 70% of the Explorer Notes on the ARK!
You Ascended off the ARK, at Beta level!
You've discovered 60% of the Explorer Notes on the ARK!
You found the Dossiers of each of ARK's initial Specimens!
You Ascended off the ARK, at Gamma level!
You personally retrieved all the Artifacts!
You've cured yourself of Swamp Fever!
You've discovered 50% of the Explorer Notes on the ARK!
You've reached the highest mountain peak of the ARK!
You've defeated ARK's three Guardians! And yet...
You defeated ARK's third Guardian!
You uncovered more than 80% of the Mini-Map!
You've discovered 40% of the Explorer Notes on the ARK!
One of your Dinosaurs reached Maximum Level!
You rode on the back of a T-Rex!
You Survived a full day and night on the ARK!
You Tamed a Dinosaur!
You Rode a Dinosaur!
You rode on the back of a Giganotosaurus!
You defeated ARK's second Guardian!
You've discovered 30% of the Explorer Notes on the ARK!
You've discovered 20% of the Explorer Notes on the ARK!
You defeated ARK's first Guardian!
You've reached the bottom of the ARK's oceans!
You discovered 10% of the Explorer Notes on the ARK!
You reached the Maximum Survivor Level!