Here is the full list of all 25 Z achievements. It takes around 5-6 hours to unlock all of the achievements on Windows.
Howitzer: Strong defence against all attackers
Volcanic World conquered
100 Territories captured
Pyros burn and burn some more
Medium Tanks are great all purpose vehicle
Build a Sniper, runs fast and shoots from a long range
Gattling gun use this against infantry
Build a Tough and launch a deadly rocket attack
Gun Turret: Defence against light armour
Desert World conquered
Build a Psycho, good fighters capable of rapid firing
Light Tanks are fast and deadly. Avoid big guns
10 Territories have been captured
Jeep are fast moving but easy to kill
Built a Grunt, grab those grenades
Completed a battle without any losses
Single player game completed
Lasers can cut through anything
A.P.C. is a deadly Troop Transport
Heavy Tanks are slow but very powerful
Mobile Missile, why fire one when you can fire three?
Double Missile Launchers are an awesome defence against everything.
Arctic World conquered
Jungle World conquered
City World conquered