Here is the full list of all 90 Aground achievements.
The base game contains 86 achievements, and there is 1 DLC pack containing 4 achievements.
Chop down a Purple Tree.
Build a Jeep.
Upgrade your Hut.
Defeat a Diode Wolf.
Forge an Evolution Gem.
Repair the Fighter Escort ship.
Collect a Pearl.
Build the Com Station.
Build a structure with a Blueprint.
Activate the Time Manipulator.
Obtain Full Cyborg Gear.
Discover a Life Pod.
Build a Submarine.
Upgrade your character with 500 or more Skill Points.
Activate the Vine Copse.
Cook a Pizza.
Defeat the Golemech.
Build the Hut.
Defeat a Boar.
Build the Storehouse.
Build the Farm.
Add an Orchard to the Farm.
Build the Smelter.
Build the Kitchen.
Get the Backpack.
Build the Workshop.
Defeat a Wyrm.
Defeat a Golem.
Mine a Diamond.
Build the Market.
Buy a Super Pack.
Now what do I do with it?
Add a Pen to the Farm.
Build the Dock.
Build a Boat.
Build the Laboratory.
Build the Wyrm Pen.
Hatch a Dragon from a Cocoon.
Build the Power Plant.
Build the Factory.
Build the Elevator.
Solve the Bandit problem.
Fly on a Dragon.
Activate the Synthesizer.
Activate the Forge.
Defeat the Old One.
Successfully Confront the Mirrows.
Read all the Logs.
Catch an Electric Eel.
Complete the Minotaur Maze.
Defeat the Wyrm Queen.
Enchant a Chainsaw.
Capture a spirit of every element.
Obtain a full set of dragon equipment.
Build a Jet.
Defeat the Kraken.
Defeat the Pirates.
Build any type of Worker Bot.
Craft your first Spellbook.
Defeat the Hail Storm.
Evolve a Dragon Ship.
Obtain a full set of witch equipment.
Build your first Space Station.
Research the Alien Locator.
Defeat a Dragomech.
Install a full set of upgraded Cyborg gear.
Defeat an Enemy Cruiser.
Complete the Museum.
Craft every Spellbook in game.
Evolve a Mecha Dragon.