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