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