Borderlands

Originally there were two issues in relation to getting any of the four collectible achievements linked to the Claptrap DLC.

The first one was a bug that is stopping a number of the collectable achievements:

A: “What a party!”
B: “It’s so realistic”
C: “Bobble-trap”
D: “The Lubricator”

Popping when they are achieved. Gearbox released a patch to fix the problem in late 2010 so this is no longer an issue.

The second issue is that the drop rates for a number of these items are obscenely low.

The best way I have found to deal with this problem is to "actively farm" MINAC - the final boss at the end of the DLC.

Now, many people are getting to MINAC, going to hide in a corner where MINAC and the Claptraps it releases can't get at them, and going away to do something else. After 3-4 hours they come back, kill MINAC and collect a tonne of items from around the area.

This I consider to be "passive farming". I have found, after much testing, that "actively farming" MINAC is immeasurably more rewards and prompts drop rates 3-6 times better than "passive farming" on all items.

"Active farming" involves dying a lot, to be blunt. But you aren't losing money when you do so, and MINAC doesn't return to full health if you do so (unlike Crawmerax) so there's no disincentive in dying.

To "actively farm", you need to shoot out all of MINACs turrets - not his "eye", but everything else. Once that is done, you can attack a bit more confidently.

Follow MINAC when he is on the move, but stay behind it so the "eye" can't get you. When MINAC stops, it will release Divine Wind claptraps - and this is when you attack.

Actively kill the claptraps from close to medium distance. What happens when you do so is that MORE and MORE spawn from MINAC.

For example, if you get in and kill the first tow claptraps to emerge from MINACs doors before those doors close, more claptraps will spawn. If you kill them, 2 more will spawn. And so on.

What happens is that instead of 2 claptraps emerging from the doors every time MINAC stops, 6-8 emerge.

Also, I found that with these extra claptraps emerging (and the greater number of dropped items which naturally appear), actively hunting them down seems to increase the chances for special drops.

In 90 minutes last night, I gathered 10 sets of 3D glasses, 6 Clapfish, 8 pink panties, 6-8 oil cans, 6-8 bobbleheads and 5 pieces of pizza. In just 90 minutes!

Once you're finished farming, kill MINAC and gather the rest of the items. But yes, get out, chase the claptraps and actively farm - its more fun and hugely more profitable.

Chris8875 has a great solution for finding the collectibles by farming MINAC.

Here is an additional trick to make things easier on yourself while farming:

Delete the Secret Armory of General Knoxxx DLC from your hard drive.

This will reinstate the game's level 50 cap system on the enemies while allowing you to keep a level 61 character/weapons.

Now, tearing through all the bosses en route and destroying the gatling cannons on MINAC will be a cinch. It's just a matter of farming MINAC for the drops.

The bobble heads will take a while to get them all, they are rather rare and you need a decent amount. So it will be a while before you collect them all.

There are two easy way to get collectibles.

1. In the hyperion dump, north of the entrance. There are quite a few claptraps.
2. Farming MINAC.

For method 1 just go to the hyperion dump, head north and kill all of the claptraps surrounding the fort. Collect any rare-drops and then save and quit. Then resume game and you will be back at the entrance and you can do it again. This is not terribly difficult but rather time consuming. I was only getting 1 or 2 rare drops in a run.

For method 2 go to MINAC and immediately run forwards and to the left. On the left hand side of the road (after the really big rock) there is a smaller rock you can hide behind. From the road looking at the rock there is a red chest to the right of it. From this position you can avoid MINAC and the DW claptraps. Pop out once and a while to destroy all of the turrets. Once you've done that it is relatively safe to go out from your hiding spot. Here is where you have some options. You can either stay in your hiding spot for hours, or you can go out and chase MINAC around killing the DWCTs quickly. The faster you kill them the more of them spawn.

I decided to use a combination. After sitting for awhile I would run out, collect items and chase MINAC around. When I got bored I just went back into hiding and walked away and did something else. I was a little hesitant to leave it over night without testing it first.

On my first run I wasn't close enough to the rock and eventually some DWCT got to me and killed me. If you are situated correctly you could die a lot if you leave it overnight.

Once you've left it run for a while hop out and collect your loot and then kill MINAC. The longer you let it go the more loot there will be. I only had to leave it going overnight (8hrs) to get the remaining items.

Loot Rarity (In my game, it may vary in others)
Pizza
Oil Can
Claptrap bobble-heads
Panties
Fish
3D glasses

Borderlands farming Method

all the guides above are really good.
this is just a video showing you where to go and where to sit at
hope this helps

Click Here For More Guides

http://www.youtube.com/user/NeedtoAchieve?feature=mhee
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All the solutions here have good tips. When I was doing my run I came across this little glitch that allows you to be in the open and not take any damage. This passive farming technique is great since you are in the open and that allows the Kamikaze Claptraps to see you and explode faster. I found doing the other safe spots won't net as many Claptraps since they won't always see you to explode and thus you get less drops.

This video is me showing you just how to stand in the right spot for the glitch. I'm not collecting the items since it's pretty obvious what to do when enough time has passed to collect the item drops.

Edit: I did find this glitch on my own. However is seems that there are videos like mine I never came across before posting this solution.