Some tips for the achievement

[Lurpsukka]

Click New Campaign. Start KringleJammer by ticking the game mode on and click start.

1) Shoot at zombies by aiming with your mouse inside your helicopters big circle. Helicopter will shoot automatically.

2) Collect nukes by being close to them and aiming at the icon. It will automatically pick it up.

3) Launch a nuke by pressing the right mouse button to aim it. Use your mouse to aim it in certain directions. Press right mouse button again to launch it.

4) Press space bar to slow time down to 10%, very effective when there's only few seconds left on the clock and also good for picking up nukes in the middle of all chaos

5) Turn on netbook mode in the options. This improved my fps from single digits to 60. Also reducing the resolution to 1024x768 is perfectly playable even on bigger monitors.

6) Setup yourself on the corners at the start of each wave and aim at the spawn points straight ahead. Use a nuke after few spawns have been cleared at start.

Got it on first try once I turned on the netbook mode in the options. Shouldn't be very hard.