First person I know of that's completed all the challenges - well done - some real tough ones in there!
Really? I'm actually surprised by that. But yeah, it definitely was no walk in the park. ET Phone Home and Kidnapped left me puzzled for a while, until I found out their surprisingly simple solutions, and I really had to dig deep to beat Oh No UFO, Space Raiders, Against All Odds, Road Warriors, and the challenges involving tagging vehicles. It was quite the wild ride.