Super Contra

Mildly tough but since your able to do this in multiplayer this makes this achievement a lot easier. Simply find someone who is good at Contra, and ask them to play Co-Op with you. I am among the very best at Contra, per leaderboards, and have helped over 60+ people with this achievement. If you can't find anyone to help you then hit me and and we'll get it done. This achievement will only require minimal skill on your part as long as you follow my directions. Basicially I'll just ask you to avoid bullets and I'll kill all enemies.

Level 5 is hard! Not as hard as it probably should be but still, its hard! Keep moving, keep shooting, if you stand still or dont keep up the pace then you will get bit (literally). As the action starts to kick in, you may get caught out by surprise by the... faces that appear in the ground! Personally ive never tried to shoot them because i never had a chance too.

Be on the lookout for ay weapons you can grab as one of them contains a nuke, which you will need to destroy the group of 'faces' that will appear and start to circle you! They can be destroyed by standard gun fire without losing a life but its very difficult, especially with the pressure the other enemies can put on you as they begin to get closer and fire pot shots at you!

As for the boss i thankfully had a couple of lives to spare when the battle began, so with careful timing i purposely walked into his face and died so then i could get back up and go psycho on the shoot button and hammer his brain directly!

Doing this meant that when i got back up i was invincible for a few crucial seconds, giving me time to shoot at the boss's brain directly. I've never done it any other way but as you will see in the video or as anyone else will tell ya, it takes a while to smash the boss the normal way.

This video will help out. 1.00-5.00 (Credit to Xplict911)
Helped me out loads and gave me a few tips and tricks that helped me out on my way to maxing this game out with a sweet 200G

Good luck soldier!