I have a blast playing this game regularly as a guilty pleasure and I've recently been going through it again to achievement hunts as a way to get more replayability from it, but there are several broken things. If you save a match to come back to later you can't. If you choose to abandon the save and go on with other missions it will ask you every time if you want to go back to your save. It does this as well in the galactic mode so you better have a couple of hours to kill to complete the whole map. There are achievements that are broken. Cranioid campaign on hard is one of them. That's why there's 0.0% completion for it. You can't download custom maps. They have their "Community Maps" section and it looks like it goes through the entire download process but it just puts you in the first default map.
