To get all the collectable achievements in Claptrap's Robot Revolution
, just kill the Claptraps and they'll drop the needed items periodically. They are classified as 'quest items', so they're green. Sadly, unlike quest items, there is no way to track how many you've collected in-game. Also, some drop more often than others, with the 3D Glasses being the most common and the Bobbleheads the rarest. Even then, the drop is ridiculously low and even after you have the achievement, the items for that achievement still drop. Persevere and collect the needed amount and you've got it!
The Rebel claptraps, Mega Samurai claptraps, Divine Wind claptraps, the Cluck-Trap mini-boss claptrap, and MINAC have all dropped at least one of each. MINAC and the three -Trap bosses all spawn plenty of Divine Wind claptraps. So, there's not much to it. It's just a huge grind. Also, make sure you're killing the actual robots. Not the creatures they've interfaced with.
The best places to go for this are the Hyperion factory and surrounding town in Dividing Faults and the small Hyperion outpost on a hill in the Hyperion Dump. By clearing the area out and then saving/reloading, the location in Hyperion Dump is definately faster.
]: There was a glitch related to this achievement, but it's fixed by a LIVE update.