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