Achievement Unlocked

Finish the game.

Guide
Simply beat the game. This will unlock as soon as you kill the final boss.

Start the game once with each of the four difficulty settings.

Guide
From the main menu, just choose Single Player and start the game on Easy. As soon as the game starts, hit pause, and quit. Then adjust the difficulty to Normal, and start the game. Do this with Hard and Hardest, as well, and once you start the game on the fourth difficulty, the achievement pops.

Score 350,000 points.

Guide
Can be obtained on Easy. Kill as many enemies as you can along the way. Clearing a level nets you 50,000 or 100,000 bonus points. Without much hassle, you should be able to get 350,000 after beating the last boss.

Reach the third level without losing a life.

Guide
Start up a game on easy with Energy: 5. You are allowed to get hit and lose Energy, but you cannot die. To make sure that you don't lose too much Energy, simply keep saving after progressing through the levels. If you lose Energy right after saving, simply exit the game and re-load, then try to beat the enemies without losing Energy. Once you pass the second boss, the achievement unlocks.

Score 250,000 points.

Guide
See Points III

Defeat the third level boss.

Guide
Slightly more challenging than Boss I, but still ridiculously easy. The tactic I used was to stand real close to the boss and hit him with the close combat attack. When the non-fireball projectiles approached me, I used the hop-up-and-roll attack to both attack the boss, the projectiles and avoid being damaged.

Defeat the first level boss.

Guide
Simply defeat the first boss in the game. All you need to do is dodge all of the heads he launches at you and then attack him. Quite simple.

Kill 30 two-headed wolves.

Guide
I'm not 100% sure, but I'm quite positive that killing the flashing white wolves also counts toward this achievement. Just kill as many of the wolves as you can, and you should be able to get this right before the end of the game.

Play in an online multiplayer game.

Guide
This should be really easy to get, but sometimes it is not. Finding someone to play with can take quite some time unless you have someone to boost with. Once you have someone to play with, the achievement unlocks just as the game starts.

Score 150,000 points.

Guide
See Points III

Collect Spirit Balls from the first three White Wolves in any level - Single Player mode only.

Guide
Without dying, kill 3 White Wolves in a row. Doesn't matter what level you do this on. I ctually messed up on the first level, but go this easily on the second. If you have problems with this achievement, you can use the save/load method. Save before each white wolf, and re-load of you are unable to kill the next.

Collect a Spirit Ball.

Guide
You'll get this in the first level. Simply kill first White Wolf 5 seconds into the level.