Megaton Rainfall

To get this achievement you will need to get the Gigaton Blast power which can be activated by holding down

Head towards the nearest city and look for a large, flat, gray rectangular space. Every city I went to has had a least one, whilst the larger cities have about 4/6 depending on the size.

Once you find it, head right down to the surface and hold for around 30 seconds. Aim towards the ground and release it. You should be pushed right up into the atmosphere to watch a short cinematic of the planet ripping apart.

I did this twice without the achievement popping, but after relaunching the game it popped about halfway through the planet being destroyed.