- Estimated achievement difficulty: 2/10
- Offline: 20 
- Online: 0
- Approximate amount of time to 1000: <5 hours
- Minimum number of playthroughs needed: 1
- Missable achievements: None
- Does difficulty affect achievements: No
- Unobtainable/glitched achievements: None
- Extra equipment needed: None
Welcome to latest release of the classic arcade game Galaga. Far from its early days as a staple of pizza parlors and mall arcades, this release is available in all of its pixelated glory for the Xbox One.
You can go into the settings to give yourself extra lives and turn on the ability to save your progress between levels. Doing so precludes you from having your scores appear on the leaderboard, but does not impact achievements, making this an incredibly easy completion. Simply play through the game. Whenever you run out of lives, reload at your latest level until you get to Stage 31.
Once you've gotten to Stage 31, there's no reason to play any further unless you want to. At this point, you can load up any level that you need to work on the achievements in question. Simply refer to the achievement guide for help.
Galaga is a nice trip down memory lane. It was the only video game in the pizza place that my parents liked to eat at when I was growing up and I dumped plenty of quarters into it back in the day. Now it also serves as a simple completion and a very nice 1000 gamerscore. Enjoy!
[XBA would like to thank Andrew x360a for this Roadmap]