Project Spark

This and the other "Play x Minutes of Community Games" are still possible to unlock now that the Project Spark servers have closed. Here's how you do it:

Firstly - getting Project Spark running in the first place without the servers is a bit of a challenge. I actually recommend taking your Xbox One offline (via Network in Settings), then starting up Spark and going into the Play menu, then going back online again. This will skip a lot of the timeouts and crap you'd otherwise need to wait through to get the game to the menus.

Once that's done: any time you spend in Crossroads will count towards the time based Community achievements, but ONLY if you complete the quest and exit through the Exit Portal. If you quit out, it doesn't seem to count this time towards the community achievements, but does count it towards the Crossroads specific achievements.

October update:

First off im sorry for those of you who attempted to go for any of the achievements that have been basically destroyed and made too easy for everyone to obtain. Blood sweat and tears for some people trying to get these achievements.

The new achievements are Retroactive so you will unlock them if you have already completed the... new... achievement requirements.

To obtain this you can just leave a community game on for 20 minutes, even if your controller will shut of it will continue to count.