Here is the full list of all 35 PixARK achievements.
Tmade a BabyTreant
Get a MolePick
Get a FlashStick
Take those treasure away
Open a highest level Chest in Ruins
Explorered the DoomLand
Get something from the Supply Crate
Tamed a Sauropod
Quetzalcoatius is the one you must needed
Killed a Large Sea Slime(Ruins)
Killed a Ice Fairy(Ruins)
Killed a Mummy King(Ruins)
Killed a Cyclops
Killed a Behemoth
Now you have killed the strongest creature in this plant.
Rex is not the most dangerous animal,but you are
Dig the Ruins in Grassland and get a Ruins cube
Dig the Ruins in Frozenland and get a Ruins cube
Dig the Ruins in Ocean and get a Ruins cube
Dig the Ruins in Swamp and get a Ruins cube
Dig the Ruins in Desert and get a Ruins cube
Dig the Ruins in Swamp underground and get a Ruins cube
Get a ArmadilloShell Equipment
Get a Scuba Equipment
Get a Bamboo blueprint
Get a Weastern blueprint
Get a Mediterranean blueprint
Get a MagicAcademy blueprint
Get a Executive blueprint
Collected your first cloth
You are the strongest man in this plant
Get a good partner
A poor creature was killed by you