Enter the Nightmare Achievement
Enter the Nightmare10
Unlock all of the Nightmare Arcade Mode levels.
There are 5 levels each with a Nightmare Mode version.
- Ghost Town
- Oil Field
- Trailer Park
The levels will all be locked except one when you first start out. As you gain stars, you will earn the levels. Your goal is to hit 24 stars between all 10 levels. That is 24/30 possible. You will need 3 stars on every regular level and 9 more between the Nightmare ones. You will have to get a 3 star on at least one Nightmare stage. The score you will need to shoot for is around 40-45k specifically for Nightmare. Just try to kills enemies as fast as you can to gain the most amount of points. You don't have to survive the full 10 minutes to get 3 stars, but it sure helps (bonuses and the sun kills remaining enemies). Just keep on your feet and always look behind you. You will have to get very good at dodging. The more familiar you are with a level the better you will be. So if you are failing, just keep trying until you start perfecting it. Do not worry about any other arcade based achievements until you have unlocked all levels. By this time you will be better at it and know what to expect.