this will save you some time in Galaga. This save was made by me Natas and was made using the Namco Museum Virtual Arcade retail disc. I don't know if it works with a regular Galaga arcade game or not. Tested and working with the retail disc.<br />
you will only have to do 3 thing legit and they are:<br />
1. Form a Dual Fighter<br />
2. Shoot down a red captured Fighter<br />
3. Shoot down all enemies in a Challenging Stage<br />
for the rest of them just use the guide at 360achievements and play what ever level you need for the achievement you are going for.<br />
example: if you need the"Scorpion" achievement the load level 5 and play the level long enough for the Scorpions to appear and then die. for the "Stage 10" achievement load level 10 and die.