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