Here is the full list of all 18 Yet Another Zombie Defense achievements. It takes around 3-4 hours to unlock all of the achievements on Windows.
Survive 6 nights without buying anything
Score 1,000,000 points in defense mode
Build and equip four turrets
Score 500,000 points in defense mode
Score 250,000 points in defense mode
Score 150,000 points in defense mode
Score 80,000 points in defense mode
Score 30,000 points in defense mode
Score 10,000 points in defense mode
Survive 10 nights without any barricades or turrets
Survive 10 nights without taking any damage
Kill 8 zombies with a single sniper rifle bullet in defense mode
Kill 8 zombies with a single rocket in defense mode
Kill 300 zombies with shotgun in a single game in defense mode
Use no more than 6 clips during the first night
Survive for 2:00 in endless night mode
Survive for 3:30 in endless night mode
Survive for 5:00 in endless night mode