Here is the full list of all 27 Yet Another Zombie Defense HD achievements worth 1,000 gamerscore.
Kill 15 enemies with a single laser beam
Kill 8 zombies with a single sniper rifle bullet in defense mode
Play through a deathmatch game
Survive for 5:00 in endless night mode
Have 25 enemies frozen at the same time in defense mode
Kill 300 zombies with shotgun in a single game in defense mode
Kill 8 zombies with a single rocket in defense mode
Kill a reaper
Score 1,000,000 points in defense mode
Score 500,000 points in defense mode
Survive 10 nights without taking any damage
Survive for 3:30 in endless night mode
Kill 70 enemies with flamethrower in one night in defense mode
Survive 10 nights without any barricades, turrets or mines
Survive night 7 or higher using grenades only
Survive night 9 or higher using mines only
Build and equip four turrets
Score 250,000 points in defense mode
Survive night 7 or higher using chainsaw only
Survive for 2:00 in endless night mode
Score 150,000 points in defense mode
Survive 6 nights without buying anything
Score 80,000 points in defense mode
Score 30,000 points in defense mode
Score 10,000 points in defense mode
Use no more than 6 clips during the first night
Abandon all hope ye who enter here