Shinobi

There's an easy, albeit tedious way to get this achievement. Start a new game and give yourself 5 lives and 5 continues. Once you get to level 2-1, play through the level normally and get all the hostages. Before you reach the final screen of the level, save. Normally, you'd see the chopper for the first time and meet some extra enemies. You have to stop just before you get to da choppa and start throwing stars. You will start to hit the enemies off screen (look at your score) and they will keep on respawning! Keep throwing stars (turn on rapid fire) and you'll get a bunch of points. Keep doing this til the timer runs out. If you don't get this to work, remember that the enemies have to be off screen! Just inch your way to the exit, throwing shurikens and stop once you see the score going up.

You'll die and get to restart the level. Rinse and repeat the method. You have 25 lives, but you don't have to use all of them to get the achievement.

I found this to be the least frustrating way of getting this achievement. It will save you the trouble of going through the entire game a second time if you played through it once already.

Plus, you can set the difficulty to hardest and get the 300k on your way to the chopper for that achievement.

I made this clip, but all credit goes to Creamium85 for his great guide. It took me about one hour to get 250000 point. Hope this clip helps

You will not score 300k on a normal playthrough, I finished my first game with around 270k. To score quick and large you have to complete levels without using your magic which gets you 5000 bonus points and if you can complete the level without firing any stars/guns and only use melee kills you will get 20,000 bonus points! It can be frustrating because the shoot/melee button are both the same, so sometimes if your just not close enough to an enemy you'll accidently shoot instead of kick/punch. Once again the save anywhere feature is your friend! If you feel the need you can save after every enemy you melee so if you mess up you just quit and reload. Just choose the levels you find easiest and 20k, 80k and 300k achievents can be earned very quick. I managed to score 300k on easy setting before the mission 4 boss level and that was not even getting all the bonus points on every level.

Shinobi

Score 300,000 points.

You can get this on Stage 2-1

Game Setting

Easy mode, 5 lives, 5 Continues

Click Here For More Guides

http://www.youtube.com/user/NeedtoAchieve?feature=mhee
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I used the great guide by Creamium85 and video by HellCreeper666 to get this. I did this after finishing the game on easy while on my way to get the chopper on hard.
It is definitely the easiest way to get it but I felt like I wasted almost an hour doing this when it could have been much faster.

I finished my easy playthrough with about 178,000 and I consider myself average to poor at this game. That left me 122k short.

Here's where I would have liked to have done it differently:

Running the clock out like the guides above takes 3 minutes.
I was netting about 10k per run.
10k x 3 minutes means you'll spend 90 minutes getting the achievement (plus saving and loading time).

Since an average player will only be about 130k short I think the best method would be to follow the above guides but only boost your score around 160k (from what you arrive at the ship with). That should give a normal player a nice cushion.
That would only take you about 48 minutes. You would pop the achievement towards the end of the first playthrough saving approximately 42 minutes of boredom. Then you just run back to the ship on hard and beat the chopper and you're done.

I hope this helps save someone some time. Happy gaming! :)