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