The first thing that you should do upon entering Galaga is to enter 'Help & Options'. Select 'Options' from the next menu. Now edit the 'Extend' option to '1st 20,000, 2nd 60,000, Every 60,000'. Earning these amount of points will earn you an extra life. Also edit the 'Lives' to 4. Now select 'Done'. Return to the Main Menu and 'Play Game'.
Stage 1
On Stage 1, you can obtain two separate achievements. It is however likely that you will need two separates runs to obtain them both. There are four 'Commander Ship' enemies in this stage. These are the green/yellow enemies that take two shots to destroy. After shooting them once, they turn purple/blue. These ships will occasionally fly towards you and pause. Do not shoot them. Walk into their beam to allow yourself to get captured. The Captured Fighter will appear red behind the Commander Ship. Note that getting captured causes a life to be lost. Make sure you have at least one extra live remaining before being captured.
Examples:
Commander Ship Beam: http://tinyurl.com/5r77o8j
Captured Fighter: http://tinyurl.com/6da76ym
You can now aim to either shoot the Commander Ship as it flies towards you, causing the Captured Fighter to be recaptured forming a Dual Fighter, or shoot the Captured Fighter for the other achievement.
If you destroyed the Captured Fighter, instead of the Commander Ship, you will unlock the "Enemy Fighter" achievement. Whilst shooting past the Commander Ship can be difficult, you may wish to instead crash into the Captured Fighter as it flies past you.
If you destroyed the Commander Ship whilst it was flying towards you, you will regain control of the Captured Fighter, earning the "Dual Fighter" achievement.
You should now progress through the game by destroying every enemy on every stage. Note that if you run out of lives, you can simply load up your most recent level by choosing '1P Start At Stage X', where X is the further stage in which you have progressed.
Stage 4
Progress to Stage 4 for your first opportunity at seeing a Scorpion. They will not appear immediately as they are a type of Transform. Avoid destroying all of the Bee enemies. One will begin to pulsate, before transforming into three Scorpions. The enemy will appear as in the achievement tile.
Destroy at least one Scorpion for the "Scorpion" achievement. Scorpions will also appear as Transforms in Stage 5 and 6, as well as levels later in the game. They appear at a 100% certainty in Challenging Stage 15.
Stage 8
Progress to Stage 8 for your first opportunity at seeing a Stingray. As with the Scorpion, the Stingrays will not appear immediately, as they are another type of Transform. Avoid destroying all of the Bee enemies. One will begin to pulsate, before transforming into three Stingrays. The enemy will appear as in the achievement tile.
Destroy at least one Stringray for the "Stingray" achievement. Stingrays will also appear as Transforms in Stage 9 and 10, as well as levels later in the game. They appear at a 100% certainty in Challenging Stage 24.
Stage 10
Continue beating levels and starting again from your most recent level until you reach Stage 10.
Upon reaching Stage 10, you will unlock the "Stage 10" achievement.
Stage 11
The first opportunity you get at destroying a Dragonfly is on Stage 11. Stage 11 is a Challenging Stage, which means there will be five waves of enemies. You must try to destroy as many as possible before they exit the screen for a point bonus. Dragonfly enemies will appear in each of the five waves on Stage 11. The enemy will appear as in the achievement tile.
Destroy at least one Dragonfly for the "Dragonfly" achievement.
Stage 12
Progress to Stage 12 for your first opportunity at seeing a Galboss. These are the third type of Transform in the game, and so will not appear immediately. Allow a Bee to pulsate and transform for three Galbosses to appear. The enemy will appear as in the achievement tile.
Destroy at least one Galboss for the "Galboss" achievement. Galbosses will also appear as Transforms in Stages 13 and 14, as well as levels later in the game. They appear at a 100% certainty in Challenging Stage 27.
Stage 19
The first opportunity you get at destroying a Mosquito is on Stage 19. Stage 19 is another Challenging Stage. Mosquito enemies will appear in each of the five waves. The enemy will appear as in the achievement tile.
Destroy at least one Mosquito for the "Mosquito" achievement.
Stage 20
Continue beating levels and starting again from your most recent level until you reach Stage 20.
Upon reaching Stage 20, you will unlock the "Stage 20" achievement.
Stage 30
Continue beating levels and starting again from your most recent level until you reach Stage 30.
Upon reaching Stage 30, you will unlock the "Stage 30" achievement.
Stage 31
The first opportunity you get at destroying a Blue Spaceship is on Stage 31. Stage 31 is another Challenging Stage. Blue Spaceships will appear in each of the five waves. The enemy will appear as in the achievement tile.
Destroy at least one Blue Spaceship for the "Blue Spaceship" achievement.
Stage 18/19
It is likely that you will not have unlocked the "Perfect Bonus" achievement through natural progression of the game. The best place to do this is on Challenging Stage 19, but it is recommended that you begin on Stage 18. Allow one of your Fighters to be captured by the Commander Ships. Now regain control of your Captured Fighter by destroying the Commander Ship as it flies towards you. As a Dual Fighter, you should finish the Stage without losing either ship.
Challenging Stage 19 is full of Mosquitoes, with some Commander Ships. The Mosquito enemies will die with one shot, whilst the Commander Ships die with two. Each wave will see the enemies spending a lot of time in the centre of the screen. Aim to remain there, mashing A or B to destroy each enemy.
This may take a few attempts to get the hang of, but is certainly the easiest Challenging Stage in the game to beat.
Once you have destroyed every enemy from the five waves of the Challenging Stage, you will unlock the "Perfect Bonus" achievement.
Congratulations, you have obtained all of the achievements in Galaga.
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