Solaris

There are a total of 60 Jukebox Songs available in the game, 10 of which can be found in Solaris. They look like spinning gold vinyl records. Finding all of them will unlock the "This Is Earth Radio" achievement / trophy.

There are a total of 25 Prints available in the game, 5 on each map. These are posters that you will find pinned to buildings, walls, etc. Finding all of them will unlock the "Gotta Catch All the Pop Art" achievement / trophy.

There are a total of 50 pieces of Artwork / Alien Artifacts available in the game, ten on each map. These are spinning objects that glow quite strongly with red light. Finding all of them will unlock the "Arty Facts" achievement / trophy.

Hidden Human Hives are buildings you must destroy using your flying saucer's weapons to unlock the "Hidden Human Hive Harvest" achievement / trophy.

On each map you can find 30 Furotech Cells scattered in different places. They look like sizable bubbles with glowing green contents. To collect them, all you have to do is get close enough to them.

Odd Jobs are side missions that you can play in Destroy All Humans! 2 - Reprobed. In order for them to become available, it will usually be necessary to complete the main story missions on the map where they take place, and sometimes other odd jobs as well.

Landing Zones are places where you can get on or off your flying saucer. You'll also get access here to such options as Pox Mart, Navicom, Gene Blender, Holopox Deck or Saucer Skins. Some of them will be available right away, some of them you'll have to unlock by performing a specific action.