I originally made this for achieve360points, but since that site is pretty much dead, I thought I might as well try to import it over to here.
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Here we are, the first dual arcade game, each with six achievements. This might be self-explanatory, but I'm going to say it just in case, the first six achievements are for Centipede and the other six are for Millipede. The only big difference between the two games is that there seems to be a lot more going on in Millipede than in Centipede. With Millipede you have loads more enemies and such, but not everything is bad, there is an advanced mode that is quite helpful to get the point achievements.
There are a couple things I want to point out, before we get to the achievements. One is that I, and many top scorers, find classic mode to be a lot easier than evolved. I'm sure this is all up to personal opinion, but I believe it's worth a shot to try classic out.
Another thing is that in Millipede, there is something called advanced mode. Advanced mode is where you basically hit a checkpoint every 15,000 points, starting at 30,000. Once you have reached a checkpoint, it gives you the option to start 15,000 points before that checkpoint, once you run out of lives. So let's say you reached the 45,000 checkpoint, if you ran out of lives before reaching the next checkpoint, you will then be given the option to start at 30,000. To activate advanced mode, just wait a second after you lose all your lives and input your initials. It should then ask you to press start for advanced mode, press start and your good to go. Just make sure you press start every time you have to continue. But be careful, every time you lose without reaching the next checkpoint; it sets you back to the previous checkpoint. And if you lose at the first checkpoint, it's game over. This is especially helpful in reaching the otherwise impossible Marauder achievement.
1. Slayer (10)
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Score over 16,543 to beat the high score table Centipede - Default difficulty.
I don't want to go into much detail on this one, since I think you should get this on your own. You need to be able to score at least this much, if you plan on getting any of the other achievements.
Here are a few pointers anyway. Keep the bottom as clear as possible, so you don't struggle with the centipede if it manages to get close. The spiders are an excellent way to get points towards the beginning, if you want don't go after the centipede until it's about half-way, just aim for the spiders. Remember the closer the spiders are to you, the more points you get. Don't worry about the dropping bugs, they only give you 200, and they are not worth the risk in my opinion. Later on you will see a snake cross the map and change the colors of mushrooms, these mushrooms make the centipedes straight down, which could be a blessing or a curse. If you manage to shoot these snakes then you will get a good sum of 1000 points.
2. Stalker (10)
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Score over 50,000 points Centipede - Default difficulty.
This is probably the hardest achievement in both of the games. This one takes a load of practice and patients. Just try to follow my pointers above, and just get a good feel for the game. Some might think it isn't worth it for 10 Gamerpoints, but if you are aiming for 200/200, then I believe it's worth it.
3. Maniac (20)
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Score over 15,000 Centipede - Throttle Monkey mode.
This one came to me easy. All I did was force the centipede down two columns of mushrooms, so basically it was coming straight down, easy for me to shoot. In fact I didn't even have to move much, but I can't say if you all will be as lucky. Just try to form a column some where, stick to it, and try your best to dodge the spiders.
4. Spirit (20)
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Have 3 lives in hand Centipede - Default difficulty.
Basically, all you need for this one is to gain a life without dieing. It is possible to get this later on during the game, but it's much easier to just get it at the beginning. You get a life every 12,000 points, so that means you need to survive until you reach that score. Not much to tell you here, except just follow the pointers above and it shouldn't take long to get it.
5. Barren (20)
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Destroy all mushrooms on the screen Centipede - Default difficulty.
I've heard some people have trouble with this, personally I didn't. Just focus on the mushrooms, and try to avoid the centipede as much as possible. You will want to wipe out the centipede when it gets into the lower regions of the board, but your main aim should be on the mushrooms. You should finish off the mushrooms, before the 3rd or 4th centipede.
6. Exterminate (20)
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Reach wave 8 without a centipede reaching the bottom Centipede - Default difficulty.
Once again, this one takes practice. You might want to try to form columns, to force the centipede down, so you can get an easy shot on it, but it doesn't always work. Just try to get rid of the centipede as fast as possible. Just keep an eye out for the snake and poison mushrooms. If the centipede hits one of those tainted mushrooms, it will rush towards the bottom. You can shoot the leading head to stop it or you can intercept it with your body. Sure this will kill you, but at least it didn't reach the bottom.
Stats as of 9/5/09
Completed XBLA: 103/137
Completed Retail: 75/95
Gamerscore Completion: 95.34%